How Ardha-Chandra Yoga forms
This is the exact condition the check above applies.
| Condition | Requirement |
|---|---|
| The grahas | All seven, Sun through Saturn |
| The houses | Seven continuous houses starting from a non-angular house — the run from the 2nd in this implementation |
| Contrast | The same run beginning on an angle gives Nauka, Koota, Chatra or Chāpa instead |
| How often it occurs | 7.0% of charts in our sample |
Sārāvalī defines it generally — any non-angular start. Our check tests the run from the 2nd; a run beginning at another cadent or succedent house would satisfy the wider classical definition without being reported here.
What Sārāvalī says Ardha-Chandra Yoga gives
Sārāvalī gives good fortune, command of forces, a brilliant physique, favour with those in authority and strength — together with gems, gold and ornaments.
It is one of the most favourable results in the whole chapter, and notably it is the yoga formed when the run misses the angles as its anchor. The half-moon is incomplete by definition, and the tradition still reads it as fortunate.
The material clause — gems, gold, ornaments — is unusually concrete. Where most Nābhasa results describe temperament, Ardha-Chandra describes possessions.
Ākṛti yogas — the shape the grahas make
Ardha-Chandra is the continuous run that refuses to start on an angle — and outperforms three of the four that do.
We measured it rather than guessed: across a sample of 398 charts, Ardha-Chandra formed in 7.0% of them.
The twenty Ākṛti yogas are named for the figure the seven grahas trace across the houses — a boat, a parasol, a bow, a lotus. Sārāvalī gives the class its own result before the individual ones: a person with any Ākṛti yoga is satisfied with their own fortune, earns through authority, is dear to those in power, and is famous. The individual yoga then says what kind of person that is.
Two things true of every Nābhasa yoga
They run continuously — Sārāvalī says the Nābhasa yogas are "effective at all times independent of Daśās", which sets them apart from almost every other yoga in Jyotiṣa. And they constrain all seven grahas at once, so most charts carry only a few and a "not present" result is the ordinary answer.
How this check works
Your chart is computed from an astronomical ephemeris on the Lahiri (Citrapakṣa) ayanāṁśa, and the formation rule stated on this page is tested against it directly — the same rule, not a paraphrase. Where the classical texts disagree about a condition, the page names the reading we follow.