Sleep is the honest diagnostic for this placement. Where the Moon holds Vyaya Bhava the interior becomes the main residence, and the first place that shows is the hours between midnight and four.

Purva Punya Bhava holds intelligence, children, romance and mantra, and a Moon there produces a mind that thinks in images rather than propositions, which is a genuine advantage and an unreliable basis for a bet.

The sixth house is a dusthana and an upachaya at once, which is why a Moon there reads badly at twenty-five and well at fifty, and why the anxiety this placement is known for so often turns into the work it is known for.

Two classical rules point in opposite directions on this one placement: the Moon holds full directional strength in the fourth house, and the fourth house is also the one the Moon is said to damage by occupying.

This is the one placement where the two charts sit exactly opposite each other, so the self is read from the partner's seat and the partner from the self's, and the native genuinely cannot always tell which is which.

Dhana Bhava governs accumulated wealth, family, food and the spoken voice, and the Moon is the one graha that makes all four of those significations literal at the same time, starting with nourishment.

The third house is an upachaya, one of the four that grow with time, and it is the only part of the chart where a weak or dark Moon is not really a problem, because the house rewards repetition rather than strength.

The house everybody dreads has better structural support than the house everybody wants: the eighth is flanked by a kendra and a trikona, while the seventh is flanked by two dusthanas.

Dharma Bhava is read as the father's house, and a Moon there quietly inverts that: the belief system these natives actually live by is almost always the one they absorbed from their mother before they could evaluate it.

Directional strength is full in a graha's own direction and absent from the house opposite it. The Moon's direction is the fourth, so the tenth house leaves it with none, in the most visible position in the chart.

Shatabhisha Nakshatra is the empty circle, ruled by Rahu with Varuna as its deity. Its four padas, its vargottama third quarter, and the hundred healers in its name.

Shravana Nakshatra is Altair, the star of the ear, ruled by the Moon with Vishnu as its deity. Its four padas, its Moon dasha, and the tradition of learning by listening.