A theory related to the three sides of a triangle, stating ...
Chronometry is the science of the measurement of time, or ...
The Islamic calendar is a lunar calendar consisting of 12 ...
The Hebrew or Jewish calendar is a lunisolar calendar used ...
Daylight saving time or summer time is the practice of ...
The minute is a unit of time or of angle. As a unit of ...
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بنود
معاجم
متابعين
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