and Maus, S.: 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
. Edmond Halley discovered this effect by examining solar and lunar eclipse records made during the Middle Ages by the Arab astronomer Abu Abdullah al-Battaani (known in the west as Albategnius).
He realized that the Moon suffered a secular acceleration
, discovered that stars have a proper motion, noted that a 1st-magnitude star is 100 times brighter than a 6th-magnitude star, and publicized the fact that timing the rare transits of Venus and Mercury across the Sun would give an accurate value for the Earth-Sun distance.