solar calendar
noun
a calendar based on the revolution of the earth around the sun, with each year corresponding to one revolution.
The grammatical form denoting more than one person, place, thing, or idea.
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Among the ancient Egyptians the same day was very noticeable, and they took care to regulate their solar calendars that it might remain unchanged.
From Astronomical Myths Based on Flammarions's History of the Heavens by John F. Blake