# The Astronomical Foundations of Astrology

The ascendant is defined as the intersection between the ecliptic and the celestial horizon and is the eastern celestial horizon. It is represented by the formula

Tan L = Sin E / cos E cos w – Sin w Tan A

where A is the latitude of the location, w is the maximum declination of the sun, E is the right ascension of the East Point (Sayana Kala Lagna) & L – the Lagna.

Raseenam Udayo Lagnam – Udaya Lagna, the ascendant, the pivot of the horoscope, is the eastern sky horizon. In astrology everything is based on Lagna, Sarvam Lagnepi Chinthayel.

180 degrees opposite the Ascendant is the Descendant, the Astha Lagna and the western celestial horizon.

Bhujamsa are the degrees that the planet goes through in the zodiac. In the mighty 360 degree circle, the planet can be anywhere and its position is its mean longitude. The planet is actually inside the ellipse and its position is the true longitude of the planet.

For example, if the planet is 42 degrees, then Bhuja’s equation says its Bhujamsa is 42 degrees. That is in the first Oja Pada, in the first quarter 0-90 degrees, the Bhujamsa is the same.

For example, if the planet is 110 degrees, then Bhuja’s equation says its Bhujamsa is 70 degrees. That is in the first yugma pada, in the second quarter 90-180 degrees, the bhujamsa is 180 – bhuja.

For example, if the planet is 200 degrees, then Bhuja’s equation says its Bhujamsa is 20 degrees. That is in the second Oja Pada, in the third quarter of 180-270 degrees, the Bhujamsa is bhuja – 180.

For example, if the planet is 300 degrees, then Bhuja’s equation says its Bhujamsa is 60 degrees. That is in the second yugma pada, in the fourth quarter 270-360 degrees, the bhujamsa is 360 – bhuja.

Bhuja Jya is Sin ( M ) and is the sine value of the Kendra. Bhuja Jya is used in the calculation of epicycles, in the calculation of the mean equation for the Moon, Jupiter and Saturn.

The manda phala, the equation of the center, is given by the formula

Equation of the Middle, Mandaphala = Circumference of the Epicycle (Parama Phala) * Manda Kendra Jya (Sin M).

This is the equation used to calculate the 14 perturbations of the Moon, the five of Jupiter and the six of Saturn.

Thanks to Govind Kumar | #Astronomical #Foundations #Astrology

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