Most, who have an interest in astrology refer to the Tropical Zodiac, which is based on the position of the sun referenced against the horizon of the earth at a particular locale. This gives you the seasons as a measure of the flow of time. No reference is made to any stars.

The Sidereal Zodiac is the position of the sun referenced against the star background, as a measure of the flow of time. The framework for the star background is the constellations the sun passes in front of. This is the one astronomers use.

Constellational Zodiac is based on the uneven constellations that lie in the path of the Sun, Moon and planets (a.k.a. the ecliptic).

By the 5th century BCE the zodiacal signs were standardized in Mesopotamia, thus the oldest in use. Sidereal is mainly used by Indian astrologers.

There was a strong connection between early western astrology and Indian astrology around the 1st and 2nd centuries, but the Indians decided to use the sidereal zodiac of the constellations rather than the tropical zodiac of the seasons.

The reason for this is probably that they had an earlier indigenous form of astrology that was based around a 27 ‘sign’ lunar zodiac called the ‘nakshatras’, and this was firmly anchored in the sidereal framework since each sign of this lunar zodiac was tied to a specific fixed star.

This prior focus on the fixed stars via their lunar zodiac made the sidereal zodiac more appealing because it lined up better than the seasons, and as a result the vast majority of astrologers in India today use a sidereal zodiac.

 

 

 

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