heliography noun. [hi:lɪ'ɒgrǝfi] M18.
[from HELIO- + -GRAPHY.]
1. (A) description of the sun. M18.

2. An early photographic process using iodine-sensitized silver plate and an asphalt or bitumen varnish. obsolete exc. Hist. M19.

3. Signalling by means of a heliograph (HELIOGRAPH noun 4). L19.

■ helio'graphic adjective pertaining to heliography;

■ heliographic latitude,

■ heliographic longitude, the latitude, longitude, of points on the sun's surface, referred to the sun's equator and a meridian passing through the node of this with the ecliptic: E18.

■ helio'graphically adverb by means of heliography L19.

[TahlilGaran] English Dictionary ▲