text:
U.S. history of alcohol minimum purchase age by state
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Minimum legal drinking age as of 1969 (two years before the 26th Amendment was passed):
Minimum age is 21
Minimum age is 20
Minimum age is 19 and 21
Minimum age is 19
Minimum age is 18 and 21
Minimum age is 18
Minimum legal drinking age as of 1975 (when almost all states had their lowest age limit):
Minimum age is 21
Minimum age is 20
Minimum age is 19 and 21; see below
Minimum age is 19
Minimum age is 18 and 21; see below
Minimum age is 18
[show]
Detail on dual age limits
Both age limits apply for following states:
Washington, D.C.: The legal drinking age is 18 for beer and wine, and 21 for liquor.
Illinois: The legal drinking age is 19 for beer and wine, and 21 for liquor.
Kansas: The legal drinking age is 18 for 3.2% ABW beer, and 21 for beer stronger than 3.2% ABW, wine and liquor.
Maryland: The legal drinking age is 18 for beer and wine, and 21 for liquor.
North Carolina: The legal drinking age is 18 for beer and wine, and 21 for liquor.
Oklahoma: The legal drinking age is 18 for 3.2% ABW beer, and 21 for beer stronger than 3.2% ABW, wine and liquor.
South Carolina: The legal drinking age is 18 for beer and wine, and 21 for liquor.
South Dakota: The legal drinking age is 18 for 3.2% ABW beer, and 21 for beer stronger than 3.2% ABW, wine and liquor.
Virginia: The legal drinking age is 18 for beer and wine, and 21 for liquor.
Minimum legal drinking age as of 1983 (one year before the Drinking Age Act of 1984 was passed):
Minimum age is 21
Minimum age is 20
Minimum age is 19 and 21
Minimum age is 19
Minimum age is 18 and 21
Minimum age is 18
The alcohol laws of the United States regarding minimum age for purchase have changed over time. The history is given in the table below. Unless otherwise noted, if different alcohol categories have different minimum purchase ages, the age listed below is set at the lowest age given (e.g. if the purchase age is 18 for beer and 21 for wine or spirits, as was the case in several states, the age in the table will read as "18", not "21"). In addition, the purchase age is not necessarily the same as the minimum age for consumption of alcoholic beverages, although they have often been the same.
As one can see in the table below, there has been much volatility in the states' drinking ages since the repeal of Prohibition in 1933. Shortly after the ratification of the 21st amendment in December, most states set their purchase ages at 21 since that was the Voting age at the time. Most of these limits remained constant until the early 1970s. From 1969 to 1976, some 30 states lowered their purchase ages, generally to 18. This was primarily because the voting age was lowered from 21 to 18 in 1971 with the 26th amendment. A lot of states started to lower their minimum drinking age in response, most of this occurring in 1972 or 1973.[1][2][3] Twelve states kept their purchase ages at 21 since repeal of Prohibition and never changed them.
From 1976 to 1983, several states voluntarily raised their purchase ages to 19 (or, less commonly, 20 or 21), in part to combat drunk driving fatalities.[citation needed] In 1984, Congress passed the National Minimum Drinking Age Act, which required states to raise their ages for purchase and public possession to 21 by October 1986 or lose 10% of their federal highway funds. By mid-1988, all 50 states and the District of Columbia had raised their purchase ages to 21 (but not Puerto Rico, Guam, or the Virgin Islands, see Additional Notes below). South Dakota and Wyoming were the final two states to comply with the age 21 mandate. The current drinking age of 21 remains a point of contention among many Americans, because of it being higher than the age of majority (18 in most states) and higher than the drinking ages of most other countries. The National Minimum Drinking Age Act is also seen as a congressional sidestep of the tenth amendment. Although debates have not been highly publicized, a few states have proposed legislation to lower their drinking age,[4] while Guam has raised its drinking age to 21 in July 2010.[5]
State
Pre-Prohibition
(prior to 1919)
Post-Prohibition
(after 1933)
1970s / 26th Amendment
(adopted in 1971)
1980s /
Drinking Age Act of 1984
21st century
Alabama
Pre 1881:
None
1881:
21 (none with consent of parent)[6] 21 1975:
Lowered to 19[7] 1986:
Raised to 21[8] 21 (no one underage is allowed consumption Section 28-1)
Alaska
? 21[7] 1970:
Lowered to 19[9] 1984:
Raised to 21 with grandfather clause (if born before January 1, 1965)[10][11] 21
Arizona
? 21[11] 1972:
Lowered to 19[12][13] 1985:
Raised to 21[8] 21
Arkansas
Pre 1925:
None[7]
1925:
21[7] 21 21[14] 21 [8] 21
California
Pre 1891:
Regulated by municipality/county (common age was 16)[15][16][17]
1891:
18 (statewide)[18] 1933:
21[7] 21 21 [8] 21 (except small amounts for religious ceremonies)
Colorado
None[11] 1945:
18: for beer
21: for wine and liquor[7] 18 [19] Raised to 21 in 1987 [8] 21
Connecticut
? 21 [11] 1972:
Lowered to 18[20] 1982:
Raised to 19
1983:
Raised to 20
1985:
Raised to 21[21] 21 (exemptions: (1) a person over age eighteen who is an employee or permit holder under section 30-90a and who possesses alcoholic liquor in the course of such person’s employment or business, (2) a minor who possesses alcoholic liquor on the order of a practicing physician, or (3) a minor who possesses alcoholic liquor while accompanied by a parent, guardian or spouse of the minor, who has attained the age of twenty-one. Nothing in this subsection shall be construed to burden a person’s exercise of religion under section 3 of article first of the Constitution of the state in violation of subsection (a) of section 52-571b.[22]
Delaware
? 21 [11] 1972:
Lowered to 20[13] 1984:
Raised to 21[8] 21
District of Columbia
? 18: for beer and wine[11]
21: for liquor[23][24] 18: for beer and wine[13][24]
21: for liquor 1986:
Raised to 21 with grandfather clause.[25][26] 21
Florida
? 18[7] 1980:
19 [27] 1985:
Raised to 21 with grandfather clause [27] 21 [28]
Georgia
? 21 [11] 1972:
Lowered to 18[12] 1984:
Raised to 19[14]
1985:
Raised to 20[14]
1986:
Raised to 21[14] 21
Hawaii
? 21[7] 1972:
Lowered to 18[13] 1986:
Raised to 21[8] 21
Idaho
? 20: for beer[29][30]
21: for wine and liquor[11][31] 1972:
Lowered to 19 (all)[13][32] 1987:
Raised to 21 in 1987 (Apr 11) with grandfather clause[8][33] 21
Illinois
1872:
Age of majority
(none with written consent of parent)[34] pre 1961: Age of majority 1961: Raised to 21 [35] 1973:
Lowered to 19: for beer and wine
21: for liquor[36] 1980:
Raised to 21[37] 21
Indiana
? Post-1934:
21[7] 21[14] 21[8] 21
Iowa
? 21[7] 1972:
Lowered to 19 in 1972 (Jul 1)
1973:
Lowered to 18 in 1973 (Jul 1)
1978:
Raised to 19 in 1978 (Jul 1)[38] 1986:
Raised to 21 in 1986 (Jul 1) with grandfather clause.[14][38] 21
Kansas
? 1949:
18: for beer and wine with less than 4% ABV
21: for liquor[7] 18: for beer and wine with less than 4% ABV[14]
21: for beer and wine with 4% ABV or more[14]
21: for liquor[14][19] 1985:
Raised to 21[8] 21 (However, anyone under 21 may consume cereal malt beverages with parental supervision on their own property)
Kentucky
? 1938:
21[7] 21[14] 21[8] 21
Louisiana
? As of 1948:
18[13] 18[19] 1987:
Raised to 21 de jure in 1987,[8]
but de facto age was still 18 until 1995 due to a sale loophole.
1995:
De facto age raised to 21 in 1995 when loophole was closed.[39]
1996:
In 1996, briefly lowered by Louisiana Supreme Court to 18 until it reversed its decision, raising to 21 three months later.[40]
Other exceptions still remain.[41] 21 (Exceptions to state law include:[42]

For an established religious purpose;
When a person under twenty-one years of age is accompanied by a parent, spouse, or legal guardian twenty-one years of age or older;
For medical purposes when purchased as an over the counter medication, or when prescribed or administered by a licensed physician, pharmacist, dentist, nurse, hospital, or medical institution;
In a private residence, which shall include a residential dwelling and up to twenty contiguous acres, on which the dwelling is located, owned by the same person who owns the dwelling;
The sale, handling, transport, or service in dispensing of any alcoholic beverage pursuant to lawful ownership of an establishment or to lawful employment of a person under twenty-one years of age by a duly licensed manufacturer, wholesaler, or retailer of beverage alcohol.)
Maine
? 21[7]
1969:
Lowered to 20 1972:
Lowered to 18[12]
1977:
Raised to 20[8][43] 1985:
Raised to 21[8] 21
Maryland
? 21[7] 1974:
Lowered to 18: for beer and wine
21: for liquor[44][45] 1982:
Raised to 21 with grandfather clause [8][46] 21 (however anyone can drink when parents, spouses, teachers are present)
Massachusetts
? 21 [11] 1973:
Lowered to 18
1979:
Raised to 20 in 1979 (Apr 16)[47][48][49] Raised to 21 in 1985 [8] 21
Michigan
? 21[7] 1972:
Lowered to 18 in 1972 (Jan 1)[50] 1978:
Raised to 19 in 1978 (Dec 3)[51][52]
1978:
Raised to 21 in 1978 (Dec 21), 18 days later.[8]
First state to raise age to 21 since it was lowered 21
Minnesota
? 21 [11] 1973:
Lowered to 18 (June 1)
1976:
Raised to 19 (Sept 1)[53]
First state to raise age after lowering. 1986:
Raised to 21[54] 21
Mississippi
? 1966:
18: for beer and wine
21: for liquor[7]
(alcohol not legalized until 1966) 18[19] Raised to 21 in 1986 [8] 21
Missouri
? 1945:
21[7] 21 21 [8] 21
Montana
? 21 [11] 1971:
Lowered to 19[55]
1973:
Lowered to 18[56][57]
1979:
Raised to 19 1987:
Raised to 21[8][58] 21
Nebraska
? 21[59]
1969:
Lowered to 20 1972:
Lowered to 19[59] 1980:
Raised to 20[14]
1985:
Raised to 21[14] 21
Nevada
? 1933:
21[7] 21 21[8] 21
New Hampshire
? 21[11] 1973:
Lowered to 18[60]
1979:
Raised to 20 1985:
Raised to 21[8][21] 21
New Jersey
Before 1880:
None
Post-1880:
18 (penalties only against businesses)[61][62][63] 21[citation needed] 1973:
Lowered to 18 [12] 1980:
Raised to 19
1983:
Raised to 21[8][64] 21
New Mexico
? 1934:
21[7] 21[14] 21[8] 21
New York
21 18[65] 18 1982:
Raised to 19 in 1982 (Dec)
1985:
Raised to 21 in 1985 (Dec)[21][66][67] 21
North Carolina
? 18[11] 18: for beer and wine[19]
21: for liquor 1983:
19: for beer and wine
21: for liquor
1986:
Raised to 21 in 1986 (Sep 1)[8][26] 21
North Dakota
? 1936:
21[7] 21[14] 21 [68] 21
Ohio
? 1935:
18: for 3.2% ABW beer
21: for beer stronger than 3.2% ABW, wine and liquor[69] 18: for 3.2% ABW beer
21: for beer stronger than 3.2% ABW, wine and liquor 1982 (Aug. 19 to Oct. 1):
19: for 3.2% ABW beer[14]
21: for beer stronger than 3.2% ABW, wine and liquor[14]
1982 (From Oct. 1):
19: beer
21: wine and liquor[70]
1988:
21[14] 21 (However, anyone can drink with parents or legal-age spouse)
Oklahoma
? Men:
21
Women:
18: 3.2% ABW beer
21: for beer stronger than 3.2% ABW, wine and liquor[71] 1976:
Lowered to 18 (for 3.2% ABW beer) for both sexes in 1976 (Dec) [72]
Last state to lower the drinking age. 1983:
Raised to 21[11][73] 21
Oregon
? 1933:
21[7] 21 21 [8] 21
Pennsylvania
? 1935:
21[7] 21 21 [8][52] 21
Rhode Island
? 21[11] 1970:
Lowered to 18[12][74] 1980:
Raised to 19
1981:
Raised to 20
1984:
Raised to 21[21] 21
South Carolina
21[75] 1935:
18: for beer and wine
21: for liquor[7] 18: for beer and wine[19]
21: for liquor 1984:
19: for beer and wine[7]
21: for liquor
1986:
Raised to 21[8] 21
South Dakota
? 1934:
21 (all)
1939:
Lowered to 18: for 3.2% beer
Raised to 19: for 3.2% beer[76] 1972:
18: for beer and wine
21: for liquor[13] 1984:
19: for beer and wine
21: for liquor[8]
1988:
Raised to 21[58] 21
Tennessee
Pre 1881:
None
1881:
21[77] 21[7]
1964:
Lowered to 18[7] 1979:
Raised to 19 1984:
Raised to 21[8] 21
Texas
Pre 1909:
21
None (with written permission of parent or guardian)
Post 1909:
21[78][79] 21[7] 1973:
Lowered to 18[80] 1981:
Raised to 19[81]
1986:
Raised to 21 in 1986 (Sep 1)[8][26] 21
Utah
? 1935:
21[7] 21[14] 21 [8] 21
Vermont
? 21[7] 1971:
Lowered to 18[82][83] 1986:
Raised to 21[21][83] 21
Virginia
? 21[84] 1974:
Lowered to 18: for beer and wine
(21: for liquor remained)[84] 1981:
Raised to 19 for off-premises consumption
1983:
Raised to 19 (all beer)
1985:
Raised to 21[84] 21
Washington
"Age of majority"
since 1877 [85] 21[citation needed] 21 21 [8] 21
West Virginia
? 18: for beer and wine
21: for liquor[11] 1972:
Lowered to 18 (all)[86] 1983:
Raised to 19
(& 21 for non-residents)[8][43]
1986:
Raised to 21[8] 21
Wisconsin
1839–1866:
18: for wine and liquor
None: for beer
Post-1866:
21 (all)[87] 18: for beer
21: for wine and spirits
1957:
21: for residents of bordering states with age limit 21.[88]
1963:
Raised to 21 (off-premises beer sales, remained 18 for on-premises).[88] 1972:
Lowered to 18 (all) in 1972 (Mar)[88]
1977:
Border state restriction lifted.[88] 1984:
Raised to 19
1986:
Raised to 21 (September 1, 1986)[88] 21 (however anyone can drink when parents, spouses, teachers are present)[citation needed]
Wyoming
? 21[7] 1973:
Lowered to 19[13] 1988:
Raised to 21 in 1988 (Jul 1)[89][90]
Last state to raise de jure drinking age to 21 21
American Samoa
? ? ? 21? 21 [91]
Northern Mariana Islands
– – ? 21? 21 [92]
Puerto Rico
? 18 18 Kept at 18
despite 10% highway funding
penalty under Drinking Age Act. 18 [93]
Virgin Islands
? ? ? 18 18 [94]
Guam
? 21? 18 18 Raised to 21 in 2010 [5]
Additional notes[edit]
Contrary to popular belief, since the National Minimum Drinking Age Act of 1984, not all states specifically prohibit minors' and young adults' consumption of alcohol in private settings. That is because the federal law is concerned only with purchase and public possession, not private consumption, and contains several exceptions. As of January 1, 2007, 14 states and the District of Columbia ban underage consumption outright, 19 states do not specifically ban underage consumption outright, and 17 states have family member or location exceptions to their underage consumption laws. Federal law explicitly provides for religious, medical, employment and private club possession exceptions; as of 2005, 31 states have family member or location exceptions to their underage possession laws.[41]
In the 1960s the age for buying or drinking beer and wine in the District of Columbia (Washington, D.C.) was 18; the age for hard liquor was 21.[23][24] Residents from Virginia and Maryland would often drive to D.C. to obtain alcohol. In Louisiana, the 1987 law raising the age from 18 to 21 was deliberately written solely to comply with the National Minimum Drinking Age Act of 1984 to avoid losing highway funding, while still allowing 18- to 20-year-olds to drink as before. Not only did it still allow 18- to 20-year-olds to consume in private, it contained a major loophole allowing bars and stores to sell alcohol to 18- to 20-year-olds without penalty (despite purchase being technically illegal) which meant that the de facto age was still 18.[39] In other words, the drinking age was 21 only on paper. This loophole was closed in 1995, but in 1996 the Louisiana Supreme Court declared a drinking age of 21 unconstitutional.[39] That briefly lowered the de jure purchase age to 18, causing an uproar which prompted the Louisiana Supreme Court to reverse its decision, raising the age to 21 three months later.[40] Other exceptions still remain to this day, including drinking in a private residence,[41] and Louisiana still has some of the most liberal general alcohol laws of any state.
Some states were "dry" well before national Prohibition was enacted in 1919, in some cases since achieving statehood. Also, some states did not become fully "wet" until several years after the repeal of Prohibition in 1933 (e.g. Mississippi in 1966). Since 1966, all states and territories of the USA have been "wet", but dry counties and towns still exist in some states.
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Jump up ^ "The Brownsville daily herald., April 23, 1909, Image 4". chroniclingamerica.loc.gov. The Library of Congress. Retrieved February 12, 2016.
Jump up ^ "The Lubbock avalanche., September 26, 1912, Image 9". chroniclingamerica.loc.gov. The Library of Congress. Retrieved February 12, 2016.
Jump up ^ Lower drinking age to 18? 2007. M.reporternews.com. Retrieved on 2011-06-22.
Jump up ^ Winckler, Suzanne. "The Street of Vrrrrmmmms" (in "The Reporter"). Texas Monthly. Emmis Communications, January 1984. Volume 12, No. 1. ISSN 0148-7736. Start: p. 74. CITED: p. 76.
Jump up ^ "Drinking at Midd: past and present". Media.www.middleburycampus.com. Retrieved 2009-09-06.
^ Jump up to: a b "Health Care in Vermont Database and Timeline" (PDF). Retrieved 2009-09-06.
^ Jump up to: a b c "History of the Legal Drinking Age". Abc.state.va.us. 1966-07-01. Retrieved 2009-09-06.
Jump up ^ What was the first legal drinking age in Wash.?. Blog.seattlepi.com (2009-11-09). Retrieved on 2011-06-22.
Jump up ^ Legal Age Cut to 18, New York Times, June 10, 1972
Jump up ^ Wisconsin Brief 95-3, January 1995, "The Minimum Drinking Age in Wisconsin"
^ Jump up to: a b c d e "Wisconsin Brief 95-3, January 1995" (PDF). Retrieved 2016-12-26.
Jump up ^ "State Raises Drinking Age". New York Times. March 12, 1988.
Jump up ^ Knudson, Thomas J. "Drinking age is fiery issue in West". New York Times, March 10, 1987.
Jump up ^ Fast Facts in Samoa at Frommer's. Frommers.com. Retrieved on 2011-06-22.
Jump up ^ Marianas Visitors Authority-Trip Essentials. Mymarianas.com. Retrieved on 2011-06-22.
Jump up ^ Vieques Travel Guide. Vieques Travel Guide. Retrieved on 2011-06-22.
Jump up ^ Virgin Islands Vacation Tips. Virginislandsmap.com. Retrieved on 2011-06-22.
94. Citation for Wisconsin drinking law: https://www.revenue.wi.gov/Pages/FAQS/ise-atundrg.aspx
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Moon illusion
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This article is about the illusion where the moon appears larger near the horizon. For the illusion where the apparent illumination source does not correspond with the position of the sun in the sky, see Lunar terminator § Lunar terminator illusion.
This article needs additional citations for verification. Please help improve this article by adding citations to reliable sources. Unsourced material may be challenged and removed. (May 2008) (Learn how and when to remove this template message)
A harvest moon
The Moon illusion is an optical illusion which causes the Moon to appear larger near the horizon than it does higher up in the sky. It has been known since ancient times and recorded by various cultures.[1][2] The explanation of this illusion is still debated.[2][3][4]
Contents
[hide]
1 Proof of illusion
2 Possible explanations
2.1 Refraction and distance
2.2 Apparent distance hypothesis
2.3 Relative size hypothesis
2.4 Angle of regard hypothesis
3 Historical references
4 References
5 Further reading
6 External links
Proof of illusion[edit]
A popular belief, stretching back at least to Aristotle in the 4th century B.C., holds that the Moon appears larger near the horizon due to a real magnification effect caused by the Earth's atmosphere. This is not true: although the atmosphere does change the perceived color of the Moon, it does not magnify or enlarge it.[5] Atmospheric refraction also makes the image of the Moon slightly smaller in the vertical direction.[citation needed]
The angle that the full Moon subtends[clarification needed] at an observer's eye can be measured directly with a theodolite to show that it remains constant as the Moon rises or sinks in the sky (discounting the very small variations due to the physical effects mentioned). Photographs of the Moon at different elevations also show that its size remains the same.[6]
A simple way of demonstrating that the effect is an illusion is to hold a small pebble (say, 0.33 inches or 8.4 millimetres wide) at arm's length (25 inches or 640 millimetres) with one eye closed, positioning the pebble so that it covers (eclipses) the full Moon when high in the night sky. Then, when the seemingly very large Moon is on the horizon, the same pebble will also cover it, revealing that there has been no change in the size of the Moon.
Between different full moons, the Moon's angular diameter can vary from 29.43 arcminutes at apogee to 33.5 arcminutes at perigee—an increase of around 14% in apparent diameter or 30% in apparent area.[7] This is because of the eccentricity of the Moon's orbit.
Possible explanations[edit]
The size of a viewed object can be measured objectively either as an angular size (the visual angle that it subtends at the eye, corresponding to the proportion of the visual field that it occupies), or as physical size (its real size measured in, say, metres). Perceived size is only loosely related to these concepts, however. For example, if two identical, familiar objects are placed at distances of five and ten meters, respectively, then the more distant object subtends approximately half the visual angle of the nearer object, but we normally perceive that as the same size (a phenomenon referred to as size constancy), not as half the size. Conversely, if the more distant object did subtend the same angle as the nearer object then we would normally perceive it to be twice as big.
One question concerning the Moon illusion, therefore, is whether the horizon moon appears larger because its perceived angular size seems greater, or because its perceived physical size seems greater, or some combination of both. There is currently no consensus on this point. Most recent research on the Moon illusion has been conducted by psychologists specializing in human perception. The 1989 book The Moon Illusion, edited by Hershenson, offers about 24 chapters written by various illusion researchers reaching different conclusions. After reviewing the many different explanations in their 2002 book The Mystery of the Moon Illusion, Ross and Plug conclude "No single theory has emerged victorious".[8] They argue that the size of the illusion is variable, but is usually an apparent increase in diameter of about 50 percent. The most important factor is the sight of the terrain, but there is a small contribution from other factors such as the angle of regard, posture and oculomotor[clarification needed] commands.
Refraction and distance[edit]
Ptolemy attempted to explain the Moon illusion through atmospheric refraction in the Almagest, and later (in the Optics) as an optical illusion due to apparent distance,[9][10] or the difficulty of looking upwards, although interpretations of the account in the Optics are disputed.[11] Similarly Cleomedes (about 200 A.D.), in his book on astronomy, ascribed the illusion both to refraction and to changes in apparent distance.[2] In the Book of Optics (1011–1022 A.D.), Ibn al-Haytham (Alhazen) repeated refraction as an explanation, but also proposed a more detailed explanation based on intervening objects and apparent distance.
Through additional works (by Roger Bacon, John Pecham, Witelo, and others) based on Ibn al-Haytham's explanation, the Moon illusion came to be accepted as a psychological phenomenon in the 17th century.[12]
Apparent distance hypothesis[edit]
Clouds near the horizon are typically farther away from the viewer, while those high in the sky are closer, giving the impression of a flat, or gently curved, sky surface
An apparent distance theory evidently was first clearly described by Cleomedes around 200 A.D. The theory proposes that the horizon moon looks larger than the zenith moon because it looks farther away. Ibn al-Haytham was more specific. His argument was that judging the distance of an object depends on there being an uninterrupted sequence of intervening bodies between the object and the observer; however, since there are no intervening objects between the Earth and the Moon, the perceived distance is too short and the Moon appears smaller than on the horizon.[2]
When we see objects such as clouds, birds, and aeroplanes in the sky, those near the horizon are typically farther away from us than those overhead. This may result in the perception of the sky itself as a comparatively flat or only gently curving surface in which objects moving towards the horizon always recede away from us.
In 1813, Schopenhauer wrote about this, that the moon illusion is "purely intellectual or cerebral and not optical or sensuous."[13] The brain takes the sense data that is given to it from the eye and it apprehends a large moon because "our intuitively perceiving understanding regards everything that is seen in a horizontal direction as being more distant and therefore as being larger than objects that are seen in a vertical direction."[14] The brain is accustomed to seeing terrestrially–sized objects in a horizontal direction and also as they are affected by atmospheric perspective, according to Schopenhauer.
A diagram of the moon seen against a cloud of the same size, at different heights in the sky. When the moon is high, the clouds it is against are closer to the viewer and appear larger. When the moon is low in the sky, the same clouds are further away and appear smaller, giving the illusion of a larger moon.
If we perceive the Moon to be in the general vicinity of the other things we see in the sky, we would expect it to also recede as it approaches the horizon, which should result in a smaller retinal image. But since its retinal image is approximately the same size whether it is near the horizon or not, our brains, attempting to compensate for perspective, assume that a low Moon must be physically larger.
Extensive experiments in 1962 by Kaufman and Rock showed that a crucial causative factor in the illusion is a change in the pattern of cues to distance, comparable to the Ponzo illusion. The horizon moon is perceived to be at the end of a stretch of terrain receding into the distance, accompanied by distant trees, buildings and so forth, all of which indicate that it must be a long way away, while these cues are absent from the zenith moon. Experiments by many other researchers have found the same result; namely, when pictorial cues to a great distance are subtracted from the vista of the large-looking horizon moon it looks smaller. When pictorial cues to an increased distance are added into the vista of the zenith moon, it appears larger.
A potential problem for the apparent distance theory has been that very few people (perhaps about 5%) perceive the horizon moon as being both larger and farther away. Indeed, most people (perhaps 90%) say the horizon moon looks both larger and closer than the zenith moon (Boring, 1962; Hershenson, 1982; McCready, 1965, 1986; Restle, 1970). Most of the rest say it looks larger and about the same distance away as the zenith moon, with a few people reporting no Moon illusion at all. However, the response that the horizon moon appears larger, but not closer than the zenith moon could be because the viewer's logic confounds his or her perception; because the viewer knows that the moon can't possibly be physically farther away, he or she is not consciously aware of the perception. This is reinforced by the idea that we do not consciously perceive distance and size, as spatial awareness is a subconscious, retino cortical cognition. Nevertheless, the apparent distance explanation is the one most often found in textbooks.
Those advocating the apparent distance hypothesis might counter that in the Ponzo illusion, people do not perceive one line to actually be farther away than another either, or that everything on the horizon is perceived as farther away, out of the habit that this is true for every object ever seen there (average-altitude clouds are about 100 times farther away at the horizon than when overhead).
Relative size hypothesis[edit]
The Ebbinghaus illusion. The lower central circle surrounded by small circles might represent the horizon moon accompanied by objects of smaller visual extent, while the upper central circle represents the zenith moon surrounded by expanses of sky of larger visual extent. Although both central circles are actually the same size, the lower one looks larger to many people.
Historically, the best-known alternative to the "apparent distance" theory has been a "relative size" theory. This states that the perceived size of an object depends not only on its retinal size, but also on the size of objects in its immediate visual environment. In the case of the Moon illusion, objects in the vicinity of the horizon moon (that is, objects on or near the horizon) exhibit a fine detail that makes the Moon appear larger, while the zenith moon is surrounded by large expanses of empty sky that make it appear smaller.[15]
The effect is illustrated by the classic Ebbinghaus illusion, where a circle appears larger when surrounded by smaller circles, than it does when surrounded by larger circles.
Angle of regard hypothesis[edit]
According to the "angle of regard" hypothesis, the Moon illusion is produced by changes in the position of the eyes in the head accompanying changes in the angle of elevation of the Moon. Though once popular, this explanation no longer has much support.[3] Looking through one's legs at the horizon moon does reduce the illusion noticeably, but this may be because the image on the retina is inverted. Raising the eyes or tilting the head when in an upright posture gives only a very small reduction in the illusion.[2]
Historical references[edit]
Immanuel Kant refers to the Moon illusion in his 1781 text Critique of Pure Reason, when he writes that "the astronomer cannot prevent himself from seeing the moon larger at its rising than some time afterwards, although he is not deceived by this illusion".[16] Schopenhauer (1813) was cited above. Wade[1] shortly summarizes historical references to the Moon illusion starting with Aristotle; he lists quotes by Aristotle (~330 BC), Ptolemy (~142, 150), Ibn al-Haytham (Alhazen) (1083), John Pecham (~1280), Leonardo da Vinci (~1500), René Descartes (1637), Benedetto Castelli (1639), Pierre Gassendi (1642), Thomas Hobbes (1655), J. Rohault (1671), Nicolas Malebranche (1674), William Molyneux (1687), J. Wallis (1687), G. Berkeley (1709), J.T. Desaguliers (1736), W. Porterfield (1737), R. Smith (1738), C.N. Le Cat (1744), D. Hartley (1749), Thomas Young (1807), and Carl Friedrich Gauss (1830).
References[edit]
^ Jump up to: a b Wade, Nicholas J (1998). A natural history of vision. A Bradford Book. Cambridge MA, London, UK: The MIT Press. p. 377 ff. ISBN 0-262-23194-8.
^ Jump up to: a b c d e Ross, Helen E.; Plug, Cornelis (2002). The mystery of the moon illusion. Oxford, New York: Oxford University Press. ISBN 019 850862 X.
^ Jump up to: a b Hershenson, Maurice (1989). The Moon illusion. ISBN 0-8058-0121-9.
Jump up ^ McCready, Don (November 10, 2004). "Finally! Why the Moon Looks Big at the Horizon and Smaller When Higher Up" (PDF). Psychology Department, University of Wisconsin-Whitewater. Retrieved December 2, 2015.
Jump up ^ "See a huge moon illusion". USA Today. 17 June 2008.
Jump up ^ Lynch, D; Livingstone, W (2001). "7.10". Color and Light in Nature. Cambridge University Press.
Jump up ^ "Large and small full moons". Astronomy Picture of the Day. NASA.
Jump up ^ Helen Ross; Cornelis Plug (2002). The Mystery of The Moon Illusion. USA: Oxford University Press. p. 180.
Jump up ^ Good, Gregory (1998). Sciences of the Earth: An Encyclopedia of Events, People, and Phenomena. Psychology Press. pp. 50–. ISBN 9780815300625. Retrieved 15 July 2012.
Jump up ^ Robinson, J.O. (1998). The Psychology of Visual Illusion. Dover Publications. p. 55. ISBN 0486404498. Retrieved 15 July 2012.
Jump up ^ Ross, Helen E; Ross, George M (1976). "Did Ptolemy understand the moon illusion?". Perception. 5 (4): 377–85. PMID 794813. doi:10.1068/p050377.
Jump up ^ Plug, Cornelis; Ross, Helen E. (1989). "Historical Review". In Hershenson, Maurice. The Moon Illusion. Psychology Press. pp. 5–30. ISBN 978-0-8058-0121-7.
Jump up ^ On the Fourfold Root of the Principle of Sufficient Reason, § 21 [ist also rein intellektual, oder cerebral; nicht optisch oder sensual]
Jump up ^ On the Fourfold Root of the Principle of Sufficient Reason, § 21 [... daß unser anschauender Verstand, nach dem Horizont hin, alles für entfernter, mithin für größer hält, als in der senkrechten Richtung]
Jump up ^ Restle, Frank (February 1970). "Moon Illusion Explained on the Basis of Relative Size". Science.
Jump up ^ Kant, Immanuel (1900). Critique of Pure Reason. Translated by J. M. D. Meiklejohn. New York: Dover Publications. p. 189. (B 354)
Further reading[edit]
Kaufman, Lloyd; Kaufman, James H. (4 January 2000). "Explaining the moon illusion". Proceedings of the National Academy of Sciences. 97 (1): 500–505. PMC 26692  . PMID 10618447. doi:10.1073/pnas.97.1.500. Retrieved 2016-11-10.
External links[edit]
Wikimedia Commons has media related to Moon illusions.
A vision scientist reviews and critiques moon illusion theories (and argues for oculomotor micropsia).
Another careful review of moon illusion research.
A physicist offers opinions about current theories
Summer Moon Illusion – NASA
"Finally! Why the Moon Looks Big at the Horizon and Smaller When Higher Up" by Don McCready, Professor Emeritus, Psychology Department, University of Wisconsin-Whitewater, Revised November 10, 2004, retrieved October 31, 2015
Why does the moon look so big now?
Why does the Moon appear bigger near the horizon? (from The Straight Dope)
Moon illusion illustrated
Moon illusion discussed at Bad Astronomy website
New Thoughts on Understanding the Moon Illusion Carl J. Wenning, Planetarian, December 1985
Father-Son Scientists Confirm Why Horizon Moon Appears Larger
NASA Astronomy Picture of the Day: Moonrise Over Turkey (16 June 2009)
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//www.ncbi.nlm.nih.gov/pubmed/10618447

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//doi.org/10.1073%2Fpnas.97.1.500

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A full moon

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Lunar libration

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Lunar terminator

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Full moon cycle

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Observing the Moon

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Hunter's moon

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Lilith (hypothetical moon)

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