An Etymological Dictionary of Astronomy and Astrophysics
English-French-Persian

The → locus of points on the → celestial sphere occupied by a star during the annual → revolution of the → Earth about the → Sun due to → annual aberration. annual aberration.

→ aberrational; → ellipse.

The locus of a point the sum of whose distances from two fixed points is constant.

From O.Fr. ellipse, from L. ellipsis "ellipse," also, "a falling short, deficit," from Gk. elleipsis "an omission," from el-, variant of en-, + leip-, stem of leipein "to leave" + suffix -sis.

Beyzi, from Ar.

The path on the sky of the apparent position of a star as seen from the Earth, due to the Earth's annual motion around the Sun.

→ parallactic; → ellipse.