曆法 日
天體自轉一週，是維一日。至若地球，太陽一昇一沉，凡閱一日。
測度日之修短，方法無算，其準確者，則自亭午始計，及於明日正午乃止，其間則一日矣。
日 (曆法)一文似未成。宜善之。This article uses material from the Wikipedia 古文 / 文言文 article 日 (曆法), which is released under the Creative Commons Attribution-ShareAlike 3.0 license ("CC BY-SA 3.0"); additional terms may apply (view authors). 若無側注，諸文皆奉CC BY-SA 4.0以行。 Images, videos and audio are available under their respective licenses.
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