Do Rahu and Ketu get ashtakavarga tables?

Not in the classical seven-planet scheme, which runs from the Sun to Saturn. Some modern practitioners extend it; the standard tables here follow the classical set.

What counts as a good sarvashtakavarga score?

The 337 total across twelve signs makes the average about 28. Above 30 is strong, below 25 weak. The relative distribution across the chart usually matters more than any single figure.

Ashtakavarga

Ashtakavarga turns a chart into numbers. For each planet it scores every sign from zero to eight, according to rules that count benefic contributions from eight reference points. The result is a numerical map of where a planet finds support and where it does not.

Bhinnashtakavarga

Each of the seven grahas from the Sun to Saturn gets its own table. For each of the twelve signs, contributions are counted from eight reference points — the seven grahas plus the lagna — according to a fixed classical scheme of which houses from each reference point are benefic for that planet. A sign can therefore score from zero to eight bindus. Four is average; five or more is generally read as supportive, three or fewer as not.

Sarvashtakavarga

Adding the seven individual tables gives the sarvashtakavarga, a single row of twelve numbers totalling 337 across the whole chart. That fixed total is what makes the figures comparable: an average sign holds about 28, so a sign with 34 is genuinely well supported and one with 22 is genuinely not, in a way that does not depend on interpretation.

The usual practical use

Transits are read against these numbers. Saturn moving through a sign holding 22 sarva bindus is read very differently from the same Saturn moving through a sign holding 34. It is one of the few parts of the tradition that produces a directly comparable quantity, which is also what makes it easy to check a calculator against a textbook.

Questions

Do Rahu and Ketu get ashtakavarga tables?: Not in the classical seven-planet scheme, which runs from the Sun to Saturn. Some modern practitioners extend it; the standard tables here follow the classical set.
What counts as a good sarvashtakavarga score?: The 337 total across twelve signs makes the average about 28. Above 30 is strong, below 25 weak. The relative distribution across the chart usually matters more than any single figure.

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Shadbala — The six sources of planetary strength — sthana, dig, kala, chesta, naisargika and drik bala — and how the rupas total is read.
The kundali (birth chart) — A janam kundali is a map of the sky at a birth moment. How the rashi chart is built, why birth time matters to the minute, and how sidereal positions are computed.
Divisional charts — the shodashvarga — D1 through D60: what each varga is read for, from the hora to the shashtiamsha, and why the higher divisions demand arcsecond-accurate positions.