These numbers indicate Old Czech Time (or Italian hours), with 24 indicating the time of sunset, which varies during the year from as early as 16:00 in winter to 20:16 in summer.
這些數字呈現的是舊捷克時（或義大利時間），以24小時顯示日落的時間在一年之中的變化，最早是在冬天的16:00，最晚是在夏天的20:16。