Astronomical term for a configuration where two celestial bodies have an angular separation of 90 degrees.
When the moon is in quadrature, the angle between the sun and the moon is about 90 degrees.
Rare term for a carpenter's square; the more common reading is かね. See 矩 (かね).
See also: 矩 (かね)
The term 矩 (く) for a carpenter's square is rarely used nowadays.