From Earth spinning on its axis and orbiting the Sun to it precessing like a top, lots of factors affect which stars you can see in the sky.
Articles on Precession of the equinoxes
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Leap years were devised in Julius Caesar’s time, to fix the pesky problem that Earth’s year isn’t exactly 365 days. But 15 centuries later, our calendars were still slightly askew.
Astronomy and astrology do not agree on the dates of the zodiac constellations.
