the earth rotates around the sun for 365.256 days.
the earth rotates around the sun for 365.256 days.
how long does the earth rotate around the sun?
365.256 days
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finally there is often a need to correct for the apparent movement of the stars. on the timescale of human civilisation the stars have largely maintained the same position relative to each other. each night they appear to rotate around the celestial poles due to the earth's rotation about its axis. however, the earth spins rather like a spinning top. not only does the earth rotate, it wobbles. the earth's axis takes around 25,800 years to complete one full wobble. the effect to the archaeoastronomer is that stars did not rise over the horizon in the past in the same places as they do today. nor did the stars rotate around polaris as they do now. in the case of the egyptian pyramids, it has been shown they were aligned towards thuban, a faint star in the constellation of draco. the effect can be substantial over relatively short lengths of time, historically speaking. for instance a person born on 25 december in roman times would have been born with the sun in the constellation capricorn. in the modern period a person born on the same date would have the sun in sagittarius due to the precession of the equinoxes.
archaeoastronomy