Put in your birth date, time and place. The calculator places your lagna and all nine grahas in their vimśāṁśa aṁśas and gives the goddess who rules each one, with her chapter where it is already written.
How it works
Each sign is divided into twenty aṁśas of 1°30′. The aṁśa is the degree within the sign divided by 1.5, with the remainder dropped and one added, so 19°29′ of Libra is aṁśa 13. Odd signs read the goddess from one column and even signs from the other, as Parāśara lists them in Bṛhat Parāśara Horā Śāstra 6.18–21. The D20 sign counts from Aries for a movable sign, from Sagittarius for a fixed sign and from Leo for a dual sign.
Positions use the True Citrapakṣa ayanāṁśa, with Spica at 0° Libra, and the mean node for Rāhu and Ketu, which is what Jagannātha Horā uses unless you change it. You can switch to the true node in the form. The lagna crosses one aṁśa in about six minutes of clock time, so the calculator also tells you how many minutes away the neighbouring goddesses are. A graha within 3′ of the edge of its aṁśa is marked, because a small error in the birth time can move it across.
What each goddess does to a planet is in her chapter, and the whole series starts with the D20 chart and its forty goddesses. Nothing you enter here leaves your browser.
