A Full Moon in the Birth Chart

A full Moon in the birth horoscope means the birth tithi is Purnima, so the Moon occupies the rashi opposite the Sun. The Moon is then at the bright end of its cycle and is classed as a natural benefic, alongside Jupiter, Venus, and a well-associated Mercury. A dark Moon, born near Amavasya, is classed with the malefics for many judgments.

Brightness is not house strength. A full Moon in the 6th, 8th, or 12th is still a bright mind in a difficult house. A full Moon in a kendra or trikona has an easier seat. Read the house after you have established the tithi.

Whatever the phase, the Moon's nakshatra chooses the opening Vimshottari mahadasha. A Purnima Moon in Rohini and a Purnima Moon in Hasta are both full, and they open under different lords, because Rohini belongs to the Moon and Hasta belongs to the Moon as well in the nakshatra scheme, while a Purnima Moon in Vishakha would open under Jupiter. The phase and the nakshatra lord are separate facts.

The Moon rules the mind, the mother, and the public mood. A bright Moon supports steadier emotions than a Moon under eclipse conditions with Rahu or Ketu. Fullness alone does not cancel a conjunction with a node.

Because the Moon is opposite the Sun, the Moon sits in the 7th sign counted from the Sun. That is a solar relationship, not the 7th house of the lagna. If someone calls every full Moon a 7th-house Moon, they have mixed the Sun's position with the ascendant. The marriage house is 7th from the lagna only.

Purnima covers one tithi, not a whole sign. A Moon merely somewhere in the opposite sign can be a day off the exact full Moon. Use the tithi if the chart gives it, and do not promote every opposition into Purnima.