Vedic birth chart

Rashi (D1) is the main birth chart. Navamsa (D9) divides each sign into nine parts of 3°20′. Each planet's nakshatra (one of 27 lunar mansions of 13°20′) and pada are listed with their lords, KP sub-lords and dignity, along with the Avakahada chakra (the birth summary from the Moon), the name letters, the Jaimini karakas, planetary friendship and special points such as Gulika, Mandi and the Arudha lagna.

Without a birth time the chart uses the Moon's sign as the first house (Chandra lagna).

Divisional charts (vargas) divide each sign into equal parts (five unequal ones for D30) and give each part a sign, so every chart looks at one area of life in finer detail. They follow Parashara's rules.

The finer the division, the faster it changes: the higher charts need a birth time accurate to a few minutes.

The Bhav Chalit chart places each planet in its house (bhava) rather than its sign. Houses are measured from the ascendant and the midheaven by the Sripati method, so a house can start partway through a sign and a planet near a sign's edge can fall in the house before or after the one its sign suggests.

It needs the birth time, because the houses come from the ascendant and the midheaven.

The Vimshottari dasha periods (mahadasha, antardasha, pratyantardasha and sookshma) follow from the Moon's nakshatra at birth: a 120-year cycle of nine planetary periods, counted in 365.25-day years.

Without a birth time the dasha dates are approximate.

Ashtakavarga gives each sign benefic points (bindus) from the seven planets and the ascendant, by Parashara's tables. Each planet's own table is its Bhinnashtakavarga; their total per sign is the Sarvashtakavarga, which always adds up to 337.

It needs the birth time, because the ascendant is one of the eight contributors.