hour circle

hour circle

A great circle of the celestial sphere passing through the celestial poles and a celestial body or the vernal equinox. An hour circle moves with the body as the celestial sphere rotates, unlike the celestial meridian of a point that remains fixed.

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Industry/Domain: Astronomy
Category: Mars
Company: NASA
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Related terms

hour

Engineering; Electronic engineering

Abbreviation, h; (sometimes, hr). A unit of time measure equal to 60 minutes or 3600 seconds.

hour

Language; Dictionaries

The twenty-fourth part of a day; sixty minutes.

hour

Mathematics; Measurements

The hour is a unit of measurement of time. In modern usage, an hour comprises 60 minutes, or 3,600 seconds. It is approximately 1/24 of a mean solar day.

circle

Sports; Cricket

A painted circle (or ellipse), centred in the middle of the pitch, of radius 30 yard (27 m) marked on the field. The circle separates the infield from the outfield, used in ...

diameter

Astronomy; Mars

The distance from one side of a body to the other, measured through the center.

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The scientific study of climate.

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Astronomy; Mars

Transmission of heat by moving heated gases. In a hot-air furnace the heated air rises and cooler, heavier air falls.

density

Astronomy; Mars

The amount of matter in a unit volume of a substance; usually the mass per unit of volume.

backscattering

Astronomy; Mars

The deflection of particles or radiation by scattering processes through angles greater than 90 degrees with respect to the original direction of motion.

azimuth

Astronomy; Mars

The distance in degrees along the horizon, westward from the south point of the horizon, to the place where a vertical circle through the star or other object intersects the ...