Sunapha, Anapha and Doorudhara yogas
Sunapha, anapha and durudhara are three yogas formed by planets placed beside the Moon. They are part of the classical group of Moon-based yogas.
What it is
Sunapha: a graha other than the Sun in the 2nd house from the Moon. Anapha: a graha other than the Sun in the 12th house from the Moon. Durudhara: planets in both the 2nd and 12th from the Moon. The traditional readings describe wealth, fame and comfort for each.
How it is worked out or read
The rule counts from the Moon's sign and is not computed by the site. The houses are shown in the birth chart, so the rule can be checked by hand.
Where it appears on this site
The Moon's sign is shown in the panchang. The Moon chart article explains the reference.
Which planets count
Mars, Mercury, Jupiter, Venus and Saturn are the planets counted. The Sun is excluded because its closeness to the Moon reflects the lunar phase rather than support, and Rahu and Ketu are excluded as shadow planets. Some texts give separate results for each planet forming the yoga.
One more note
When the Moon is in a kendra from the Lagna with these yogas present, many readers consider the support stronger still.
The three lunar yogas
These yogas look at the signs on either side of the Moon. Sunapha forms when one or more grahas, other than the Sun, occupy the second sign from the Moon. Anapha forms when they occupy the twelfth sign from the Moon. Durudhara, also written Doorudhara, forms when there are grahas in both. Rahu and Ketu are excluded in the usual definitions. When none of these is present, the result is Kemadruma, the yoga of an isolated Moon.
What they describe
The Moon represents the mind and its support, so planets beside it are read as accompanying and sustaining it. Sunapha, with planets ahead of the Moon, is associated in the texts with self-earned wealth, intelligence and good reputation. Anapha, with planets behind it, is associated with good health, a pleasing personality and comfort. Durudhara, with planets on both sides, combines these and is described as giving wealth, generosity and enjoyment. The specific results are coloured by which planets are involved.
Reading them sensibly
Because most charts have at least one planet on one side of the Moon, one of these three yogas is present in a large majority of charts. Their value is less in their rarity than in what they say about the Moon's company: benefics beside the Moon are read as gentle support for the mind, malefics as pressure. The planet table on this site's chart page shows the signs needed to check them in a moment.
The Moon's neighbours
Sunapha, anapha and durudhara all depend on the planets placed beside the Moon, in the second or twelfth house from it. The reader counts from the Moon's sign and checks which grahas occupy those houses. The three yogas are read as a family, and the reader describes the one that applies rather than all three.