The Great Comet of 1843, formally designated C/1843 D1 and 1843 I, was a long-period comet which became very bright in March 1843 (it is also known as the Great March Comet).
Great Comet of 1843年大彗星，正式名稱C/1843 D1和1843 I，是長週期（英语：List of near-parqbolic comets）的彗星，它在1843年3月變得非常明亮（也被稱為3月大彗星）。