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Most Vaidik astrology software calculates the Special Lagna for you, but it helps to understand the principle used in finding them. Normally the speed at which the Lagna, also known as the ascendant, traverses the different Raashi throughout the day varies, as the path of the Lagna along the ecliptic is elliptical.

Paraashar advises us to derive the Special Lagna from the archetypal 360-degree circle without allowing for the elliptical irregularities of physical reality. Simple math divides the arc the ascendant has traveled from the moment of sunrise until the birth time of the chart,
by 12 for the Bhaav Lagna;
by twice that, or 24, for the Horaa Lagna; and
by five times 12, or 60, for the Ghatikaa Lagna, and projects them from the point of sunrise.

The timing of sunrise is considered to be the "upper limb" of the Sun, before the disc of the Sun arrives; the moment of dawn when songbirds break out in their morning chorus. From sunrise, the Bhaav Lagna moves 15 degrees per hour, until the moment of the birth or event; the Horaa Lagna 30 degrees per hour; and the Ghatikaa Lagna 75 degrees per hour.

The Bhaav Lagna is found 30 degrees or less from the normal Lagna; based on a multiple of one Sign, the Bhaav Lagna represents the concept of self, the fixed, unchangeable Dharm or life purpose of the chart native. The Bhaav Lagna may be in the 2nd or 12th house instead of the 1st, in which case the life purpose may be at variance from the apparent views and presentation of self shown by the normal Lagna.

source : www.councilvedicastrology.org/FA_SL. htm

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