387. Sun

See also 25. ASTRONOMY ; 85. CLIMATE ; 100. COSMOLOGY ; 143. EQUATOR ; 245. LIGHT ; 318. PLANETS ; 417. WEATHER .

celidography

Archaic. a description of the surface markings on a planet or the spots on the sun.

coronagraphy

the observation of the corona of the sun by use of a telescope modifled to simulate an eclipse. —coronagraphic, adj.

heliodon

an instrument used in astronomy to show the apparent movement of the sun.

heliography

1. the measurement of the duration and intensity of sunlight.

2. the system or process of signaling by reflecting the sun’s rays in a mirror.

3. an early photographic process involving coated metal plates exposed to sunlight. —heliographer, n. —heliographic, heliographical, adj.

heliolatry

the worship of the sun. — heliolator, n.

heliology

Archaic. the science of the sun. — heliologist, n.

heliomania

an abnormal love of the sun.

heliophobia

1. an abnormal fear of sunlight.

2. an avoidance of sunlight.

helioseismology

the study of motions of the solar surf ace.

heliotherapy

a method of treating illness by exposure to the rays of the sun.

pyrheliometer

an instrument for measuring the intensity of the sun’s radiation. —pyrheliometric, adj.

radiometer

an instrument for measuring the intensity of radiant energy, composed of vanes which rotate at speeds proportionate to the intensity of the energy source. —radiometric, adj.

radiometry

the measurement of radiant energy by means of a radiometer. —radiometric, adj.

radiophony

the transformation of radiant energy into sound.

siriasis

1. sunstroke.

2. Obsolete, a sun bath or exposure to the sun for curative purposes.

solarism

1. the explanation of myths by reference to the sun or the personifi-cation of the sun, as the hero as sunfigure.

2. an overreliance on this method of interpretation. —solarist, n.

solarium

a room designed and situated so as to receive the maximum amount of sunlight.