That part of a circle, parallel to the equator, which is described by a celestial body from its rising to its setting.
See diurnal arc. ...
The Sailor's Word-Book
Half the arc described by a heavenly body between its rising and setting. ...
·adj A daybook; a journal. II. Diurnal ·adj A diurnal bird or insect. III. Diurnal ·adj Opening du...
Webster's Dictionary of the English Language
·noun An <<Arch>>. II. Arc ·noun A portion of a curved line; as, the arc of a circle or of an <<Ell...
, or arch The segment of a circle or any curved line, by which all angles are measured. ...
See parallax. ...
·add. ·- The light of an arc lamp. ...
See nocturnal arc. ...
That part of a circle, parallel to the equator, which is described by a celestial object, between it...
The arc which a planet appears to describe when its motion is direct or progressive in the order of ...
The sun's depth below the horizon when the planets and stars begin to appear. ...