Sidereal zodiac

Since 2011, a current school of sidereal astronomy has included Ophiuchus as the 13th constellation of the sidereal zodiac.

To the ancient civilizations that used astrology for over 3200 years, the start of spring marked the beginning of the year, since it was the time when life was returning to sprout, which is why the beginning or zero point of the Zodiac in the ecliptic as established using the vernal equinox point.

Differences to date (2011) between the tropical Zodiac, inner circle and the sidereal Zodiac, half circle, and astronomical physics Zodiac: The yellow line represents the point of Aries at the vernal equinox for the northern hemisphere (the sidereal zodiac, assuming a ayanamsa of 23.86 ° according to the NC Lahiri).

An equinox in astronomy is a moment in time (not all day) when the Sun can be observed directly on Ecuador ( Vernal Point ) and there are around 20 March and 23 September each year. There are two equinoxes during the year: the equinox of spring and fall equinox (for the northern hemisphere), are two days when night and day have the same length.

From Vernal point divided the ecliptic into segments of 30 ° to delimit the 12 signs of the Zodiac. Due to the precession of the equinoxes, the difference between the Sidereal Zodiac and the Tropical Zodiac is about 24 °, taking into account that each sign is valid for approximately 30 days, approximately 85% of people belong to another sign in the Sidereal Zodiac (the immediately preceding).

The first degree of the Sidereal zodiac is measured from a point 180 degrees opposite the star Spica and first grade versus Western zodiac is when the sun reaches the top position of Ecuador, when it is also the spring equinox .