Q

Ql—Larger lunar elliptic diurnal constituent. See M1. Speed = T – 3s + h + p = 13.398,660,9° per solar hour.

2Q1—Lunar elliptic diurnal, second order, constituent. Speed = T – 4s + h + 2p = 12.854,286,2° per solar hour.

quadrature of Moon—Position of the Moon when its longitude differs by 90° from the longitude of the Sun. The corresponding phases are known as first quarter and last quarter.