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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。
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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