ephemerist

n.

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

2. One who keeps an ephemeris; a journalist.

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[fr. Gk ephemeris, diary]  /ee PHEM er ist/
1) obs.  one who keeps an ephemeris; a journalist
2) obs.  one who studies the daily motions and positions of the planets
3) a collector of ephemera [paper items (as posters, broadsides, and tickets) that were originally meant to be discarded after use but have since become collectibles]