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Thai ascendant (lagna) calculator

Thai astrology places your lagna, the rising sign, from the time of birth counted from sunrise, and calculates the positions of the Thai planets with the traditional Thai method (sidereal signs). Enter your birth date, time and time zone.

Without a longitude, the time is used as Thai clock time, as on the Thai page by default. With a longitude, it is turned into local mean time, like the Thai option “cut by local time”. Nothing is stored.

About the Thai lagna

In Thai astrology the day is counted from sunrise (taken as 6:00 in the classic method). The lagna is the sign rising on the eastern horizon at the moment of birth, and it is the first house (tanu) of the Thai birth chart. The planets are numbered: Sun 1, Moon 2, Mars 3, Mercury 4, Jupiter 5, Venus 6, Saturn 7, Rahu 8, Ketu 9 and Uranus 0. Signs are sidereal, so they sit about 24 degrees behind the Western tropical signs.

Translated from the Thai page; the lagna verses are Pali lines quoted in Thai astrology books, with their traditional meaning. The Thai page also offers a “true sunrise” option, which uses a Thai sunrise table and is not offered here.

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