The lagna is the sign that was rising on the eastern horizon at the moment of birth. The chart's first house begins here — body, temperament and the frame of the whole life open through the lagna, which is why prediction ranks it even above the Moon sign.
The Earth's rotation raises a new lagna every ~2 hours — two people born the same day can have different ascendants. Minute-level birth-time accuracy and the latitude-longitude of the place are decisive; Swiss Ephemeris yields the sidereal degree of the rising point.
Lagna or Moon sign — which rules the result?
Body, temperament and career-structure follow the lagna; mind, observances and transit horoscopes follow the Moon sign. Full prediction blends both.
What if my birth time is off by 10-15 minutes?
Usually the lagna stays the same, but near a boundary it can shift — check the degrees in the result: near 0°-1° or 29°-30°, get the time rectified.
What does the lagna degree mean?
It shows how far the rising sign had climbed — the basis for the Navamsa and other divisional charts and house boundaries.
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