parapegma

From Latin parapegma, from Ancient Greek παράπηγμα (parápēgma, “something fixed on or hung up”) .[1]

parapegma (plural parapegmas or parapegmata)

1. A device for keeping track of cyclical events, particularly of stars, weather, seasons, and so on.
   • 2007, Daryn Lehoux, Astronomy, Weather, and Calendars in the Ancient World, page 12:

     At its most basic, the word parapegma (plural:parapegmata) describes any instrument that tracked cyclical phenomena by the use of a moveable peg or pegs.

• almanac

• parapegm