Aah, Egyptian God

Moon god of the Egyptians which was symbolized as a young man wearing the solar disk and the lunar crescent.
Funk and Wagnalls, ©1950 paraphrased

A'ah (A'oh) Moon deity of Egypt, also called A'oh in some ancient records, and was identified before c. 3000 B.C.E. when Narmer attacked the north to unite the Upper and Lower Kingdoms. A'ah was associated with the popular god Thoth, the Egyptian divinity of wisdom, a patron of the rites of the dead. In the Fifth Dynasty (2465-2323 B.C.E.) A'ah was introduced into the Osiris (god of the dead) cult. A'ahis depicted in the Lamentations of Isis and Nephthys, an Osirian devotion document, as sailing in Osiris' ma'atet boat, believed by the Egyptians to be a spiritual vessel of power. In some of the versions of The book of the Dead, the speels and prayers offered for decased Egyptians to aid them in their journeys in the Underworld. Osiris is praised as the god who shines forth in the splendor of A'ah, the Moon.
A'ah was also included in the religious ceremonies honoring Horus, the son of Isis and Osiris. The moon was believed to serve as a place of final rest for all "just" Egyptians. Some of the more pious or holy deceased went to A'ah's domain, while others became polar stars.
Encyclopedia of Ancient Egypt, Margaret R. Bunson paraphrased

Aah, A shadowy figure who appears to work behind the scenes pulling strings.
In records, Aah is closely associated with Khonsu, Osiris and Thoth, but apparently to the Egyptians was superior to them. Perhaps because he rules the 360-day moon calender which governs the year. Aah is best known for gambling away five days of moonlight in a dice game. Because Ra (the sun god) had laid a curse upon Sky Goddess Nut, she could not give birth to a child on any day of any year. So the sympathetic Thoth gambled with Aah, and won five days worth of moonlight. (And as any cosmological person will know, moonlight is not measured in litres or kilograms, but hours and days.) Thoth took this moonlight, divided it into five days and inserted it into the month of July. Because these extra days were not covered by Ra's curse, Nut discovered she could give birth during that time. So Isis, Osiris, Horus, Set and Nephthys are all children of July. And since that time the year has remained 365 days.
Egyptian Mythology paraphrased

Aah (pronounced like "awe"), was an old moon god in charge of the moon-year. His name meant "collar", "to embrace" and "defender". His duties were shadowy and he was seen as a moon crescent often with sun disk upon it. He accompanied mainly Thot and Khons, including others including Osiris. He could be seen as Thoth-Aah with a crescent upon a pedestal standing in a boat. Aah is mentioned in "The Book of the Dead", in a prayer presenting himself as: "I am the moon-god Aah, the dweller among the gods". The most famous role he plays in Egyptian mythology was in a tale where he gambled with Thoth and made him help the pair Nut and Geb to raise a family.
Aah gambled with Djehuti (Thoth) and lost, resulting in five extra days added to the year.

Aah, 114 Gods of Ancient Egypt, paraphrased

Aah, Egyptian god
  • Aah is sometimes depicted with the sun disk on top of the moon crescent.
  • Aah was sometimes depicted as Osiris-Aah (or Asar-Aah), the moon crescent and solar disk on the head of Asar (Osiris).
  • Aah gambled with Djehuti (Thoth) and lost, resulting in five extra days added to the year.
  • Aah’s symbol is the crescent moon. Aah was often depicted as Thoth-Aah, a crescent moon resting on a Thoth pedestal resting on a boat.

Source: Aah-te-Huti, native ancient Egyptian (Kemetic) God of the Moon.