Pillar article
Janma Lagna and the Life Counted From It
Janma lagna is the sidereal sign on the eastern horizon at the birth minute, and it becomes the 1st house. Every other house in the kundli is counted from that sign.
The horizon is the whole chart
Planets already occupy signs before you know the lagna. Those signs are not houses yet. If Mars is in Taurus, Mars is simply in a sign until the rising sign is known. Should the lagna be Scorpio, that Mars falls in the 7th. Should the lagna be Taurus, it falls in the 1st. The same ephemeris position becomes a marriage planet or a body planet according to one sign on the eastern horizon. That is why a birth time rounded to the hour can hand you the wrong life.
The lagna lord shows where the self goes
Each lagna has a lord. For Cancer the lord is the Moon. For Leo it is the Sun. For the others it is the planet that rules that sign. The house that lord occupies is where the life leans. A lagna lord in the 10th ties the person to work. A lagna lord in the 7th ties the person to marriage. A lagna lord in the 12th spends the self on foreign places, sleep, or loss. The sign of the lagna sets the temperament. The lord's house sets the plot.
City and daylight saving move it
The birth city is geocoded, and the zone offset in minutes is applied before the Julian day. Where the region observes daylight saving, that offset changes on the clock-change dates, and the lagna can change with it. Phoenix does not observe daylight saving. New York does. Two births at the same clock time on the same day in those two cities are not the same horizon. Jyothish SI casts this with the Lahiri ayanamsa and Swiss Ephemeris. The Moon sign alone cannot stand in for it.
Frequently asked questions
Is the janma lagna the same as the Moon sign?
No. The Moon sign is where the Moon sits. The lagna is the sign rising in the east. Houses are counted from the lagna.
How much does a wrong birth time matter?
Signs rise in unequal spans, on the order of a couple of hours. A wrong hour can move every house, including the 7th and the 10th.
What does the lagna lord tell you?
The house it occupies. That is the department of life where the person is most committed.
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D1, D9, D10, dashas, yogas, and transits, the same calculations referenced in this article.