A lunar calendar is a calendar that is based on cycles of ...
The Gregorian calendar is internationally the most widely ...
The second is the base unit of time in the International ...
A theory related to the three sides of a triangle, stating ...
A system of measurement is a set of units of measurement ...
The hour is a unit of measurement of time. In modern ...
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用語
グロッサリ
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フォロワー
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107
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95
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