ALMUTEMThe Lunar Mansions
Beyond the twelve signs, tradition divides the Moon's path into twenty-eight mansions — roughly one for each day of its cycle. Each mansion has its own character and actions it favours or discourages.
What they are
The Moon travels the zodiac in about twenty-seven days; each mansion is a slice of just under thirteen degrees. It is an ancient system, of Arabic and Indian origin, later gathered by authors such as Agrippa, the Picatrix and Robson.
What they are for
Traditionally, the moment to travel, plant, buy or attend to something is chosen according to the mansion the Moon occupies — each favours certain actions and discourages others.
In the Almanac
The Moon's mansion is part of the assessment of some days, especially for planting, travelling, buying and business.
The tradition
Agrippa, the Picatrix and Robson — public-domain sources.