secular acceleration

secular acceleration

The apparent speeding up of the Moon in its orbit around the Earth, caused by tidal friction and the gravitational attraction of other planets. It amounts to 10.3 arc seconds per century. It first became apparent from records of ancient eclipses.

secular acceleration

[′sek·yə·lər ak‚sel·ə′rā·shən]
(astronomy)
An apparent gradual acceleration of the moon's motion in its orbit, as measured relative to mean solar time.
References in periodicals archive ?
2014, Geomagnetic secular acceleration, jerks, and a localized standing wave at the core surface from 2000 to 2010.
William Fishburn Donkin born; Savilian professor of astronomy at Oxford 1842-'69; wrote The Secular Acceleration of the Moon's Mean Motion, 1861.
One of these prizes, offered by the Paris Academy of Sciences in 1773, was for an explanation of the Moon's secular acceleration.