An Etymological Dictionary of Astronomy and Astrophysics

An astronomical and meteorological calendar written by ancient Greeks from 450 B.C. during at least three centuries. The parapegma was an inscribed stone for public use. It had holes beside the inscription, in which a peg could be inserted next to the appropriate day. The term was later applied to purely written forms of such calendars, or almanacs; plural form parapegmata.

See also: From → para- “next to” + pegma “something that fastens something else together,” from pegnyein “to stick.”