Heliometer
From LoveToKnow 1911
HELIOMETER (from Gr. Oros, sun, and ÆTpov, a measure), an instrument originally designed for measuring the variation of the sun's diameter at different seasons of the year, ...
heliometer: has two distinct meanings:
(a) a telescope which produces two images of the sun which can be manipulated to determine its angular size (semi-diameter) accurately.
Heliometer
Instrument to measure the apparent diameter of the Sun at different seasons, also used to measure angular distances between stars.
Helium ...
silver-disk pyrheliometer An instrument used for the measurement of direct solar radiation. See pyrheliometer. It is constructed in the following manner.
Eppley pyrheliometer (NASA SP-7, 1965) A pyrheliometer of the thermoelectric type. Radiation is allowed to fall on two concentric silver rings, the outer covered with magnesium oxide and the inner covered with lampblack.
Solar radiation is commonly measured with a pyranometer or pyrheliometer.
Climate effect of solar radiation ...
X-ray telescopes (S-054 sponsored by American Science and Engineering and S-056 sponsored by Marshall Space Flight Center); an X-ray and extreme ultraviolet camera (S-020 sponsored by the Naval Research Laboratory); an ultraviolet spectroheliometer ...
Device for recording the positions of SUNSPOTS. [A84]
Heliometer
Instrument to measure the apparent diameter of the Sun at different seasons, also used to measure angular distances between stars. [A84]
Helium ...
Solar heat and energy are measured by an instrument called the pyrheliometer. Other instruments devised especially for the study of the sun are the coronagraph and the spectroheliograph.
This method was first successfully used by Friedrich Wilhelm Bessel in 1838 when he measured the distance to 61 Cygni with a heliometer, ...
Sunlight may be recorded using a sunshine recorder, pyranometer or pyrheliometer. The World Meteorological Organization defines sunshine as direct irradiance from the Sun measured on the ground of at least 120 WÂ-mâˆ'2.[1] ...
 See also: Orbit, Earth, Distance, Solar, Sun
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