Pillar article
Sun, Moon, and Lagna: Three Calculated Points
The Sun is the graha of authority, vitality, and the father. The Moon is the mind and the nakshatra from which Vimshottari begins. The lagna is the sign on the eastern horizon at the birth minute, and it changes about every two hours. These three points answer three questions. A newspaper that prints one of them and calls it the whole person has skipped the other two calculations.
What each one rules
The Sun rules Leo, is exalted in Aries, and is debilitated in Libra. His mahadasha is six years, the shortest of the nine, and he never retrogrades. In the chart he shows where visibility and the father-principle land. The Moon rules Cancer, is exalted in Taurus, and is debilitated in Scorpio. His mahadasha is ten years, and his nakshatra opens the entire 120-year sequence. The lagna has no single ruler until the rising sign is known: Mars for Aries or Scorpio, Venus for Taurus or Libra, and so on through Saturn for Capricorn and Aquarius. The lagna lord's house is where life is spent. The Sun's house is where one is seen. The Moon's house is where one feels.
They move on different clocks
The Sun stays in a sidereal sign for about a month. The Moon stays for about two and a half days. The lagna stays for about two hours. A birth certificate that is wrong by one hour can keep the Sun and the Moon and still change the rising sign, the 7th house of marriage, and the 10th house of career. The birth city matters because the zone offset, in minutes, is applied before the Julian day. Daylight saving changes that offset where it is observed. Indian births stay on Asia/Kolkata, UTC plus 5 hours 30 minutes, all year, and the city is still required for the horizon. D9, used for marriage, is more sensitive to the minute than the Sun's sign is.
How to ask a question
Ask the lagna for the body, the marriage houses, and the career houses. Ask the Moon for mood, mother, the dasha, and transits such as Sade Sati. Ask the Sun for father, office, and the six-year period of pure solar visibility. A conjunction of Sun and Moon is Amavasya, a New Moon birth, which presses the Moon with the Sun's glare. That is a fourth fact, a phase, not a substitute for the lagna. Jyothish SI computes all three with Lahiri ayanamsa and Swiss Ephemeris on a free kundli. The useful mystery is that they disagree often, and the reading is the disagreement, handled house by house.
Frequently asked questions
Which point changes fastest?
The lagna, about every two hours. The Moon changes nakshatra about daily and sign about every two and a half days. The Sun changes sidereal sign about monthly.
Does the Sun ever go retrograde?
No. The Sun's six-year mahadasha is always of a direct Sun. Weakness comes from debilitation in Libra, from house placement, or from hard aspects, not from retrogression.
Which of the three starts the dasha?
The Moon's nakshatra. The lagna decides the houses. The Sun decides solar topics and owns a six-year mahadasha when his turn arrives.
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D1, D9, D10, dashas, yogas, and transits, the same calculations referenced in this article.