The Collaborative International Dictionary
Ephemerist
Ephemerist \E*phem"er*ist\, n.
One who studies the daily motions and positions of the planets.
--Howell.One who keeps an ephemeris; a journalist. [1913 Webster] ||
Wiktionary
ephemerist
n. 1 One who studies the daily motions and positions of the planets. 2 One who keeps an ephemeris; a diarist.