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The Collaborative International Dictionary
Ephemerist

Ephemerist \E*phem"er*ist\, n.

  1. One who studies the daily motions and positions of the planets.
    --Howell.

  2. 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.