曆法 日
一日係地球自轉一週嘅時間。萬國標準單位入面，一日定義做 86,400 秒。
一日係日頭加夜晚。
一日有12個時辰，或24個小時，或1,440分鐘，或86,400秒。
但有啲時候，亦有人會將一日理解為淨係日頭，因為「日」亦可解作太陽，地球大部份地區都係只有日頭先有太陽；另外，多數人都係喺日頭返工或者返學嘅，所以一日喺咩意思，就要睇番情況而定喇。
其他
日頭嘅長短，喺一年裏面嘅四季係唔同嘅，呢樣嘢係因為地球嘅軸係傾斜咗大約23.5度嘅。而喺地球唔同嘅緯度，個季節亦都係唔同嘅。
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