Bhaava Lagna
Bhaava lagna is at the position of Sun at the time of sunrise. It moves at the rate of one rasi per 2 hours. In the rest of this book, bhava lagna will be denoted by BL.
If sunrise takes place at 6:00 am and Sun is at 6s 447' then, horalagna is at 6s 447' at 6:00 am, at 6s 1947' at 7:00 am, at 7s 447' at 8:00 am, 8s 447' at 10:00 am and so on. Bhavalagna moves at the rate of 1 per 4 minutes (i.e., 15 per hour).
Hora Lagna
Hora lagna is at the position of Sun at the time of sunrise. It moves at the rate of one rasi per hora (hour). In the rest of this book, horalagna will be denoted by HL.
If sunrise takes place at 6:00 am and Sun is at 6s 447' then, horalagna is at 6s 447' at 6:00 am, at 6s 1947' at 6:30 am, at 7s 447' at 7:00 am, 8s 447' at 8:00 am and so on. Horalagna moves at the rate of 1/2 per minute (i.e., 30 per hour).
Ghati Lagna
Ghati lagna is at the position of Sun at the time of sunrise. It moves at the rate of one rasi per ghati (ghati=1/60th of a day, i.e., 24 minutes). In the rest of this book, ghatilagna will be denoted by GL. Ghati lagna is also called “ghatika lagna”.
If sunrise takes place at 6:00 am and Sun is at 6s 447' then, ghatilagna is at 6s 447' at 6:00 am, at 6s 1947' at 6:12 am, at 7s 447' at 6:24 am, 8s 447' at 6:48 am and so on. Ghatilagna moves at the rate of 115' per minute (i.e., 30 per 24 minutes).
Sree Lagna
In Sanskrit, the word “Sree” means wealth. It also means Lakshmi, wife of Lord Narayana and goddess of wealth. Sree Lagna will be denoted by SL in the rest of this book. Sree Lagna is important for prosperity. Its use will be shown in the chapter on Sudasa. Computation of Sree Lagna will be explained for now.
(1) Find the constellation occupied by Moon.
(1) Find the fraction of the constellation traversed by Moon.
(1) Find the same fraction of the zodiac (360).
(1) Add this amount to the longitude of lagna. Subtract multiples of 360 if necessary. The resulting amount is the longitude of Sree Lagna (SL).
Example 4:
Let us take a native with Moon at 13 Li 06 and lagna at 25 Vi 05. Moon’s longitude is 180 + 136' = 1936'. Lagna’s longitude 150+255' is 1755'.
(1) Moon is in Swathi constellation, which runs from 640' to 200' in Libra.
(1) Moon’s advancement in his constellation is 136' – 640' = 626'. As fraction of the whole constellation, this is (626')/(1320') = 386'/800' = 0.4825.
(1) The same fraction of the zodiac is 0.4825 x 360 = 173.7 = 17342'.
(1) Adding this amount to the longitude of lagna, we get 1755' + 17342' = 34847. This is the longitude of SL. So SL is in Pisces at 1847'.