English: The yellow line is the ecliptic, the path traced by the Sun through the Earth's year. The purple line is a projection of the Earth's equator on to the celestial sphere. The crossing point (red circle) of these two lines is the spring equinox. In 1500 BC it was near the end of the Aries constellation, in 500 BC it was near the beginning of the Aries constellation and in AD 1000 to 2500 it is in Pisces.
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