Hour Angle
Related Category: Astronomy: General
in astronomy, a coordinate in the equatorial coordinate system.
Hour Angle
From LoveToKnow 1911
HOUR ANGLE, the angular distance of a heavenly body from the meridian, as measured around the celestial pole.
hour angle
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Hour Angle
The angle between an observer's and the on which some celestial body lies.
Hour Angle The angular measure of the distance of an object from the local meridian.
hour angle: [h, HA] the angle corresponding to the sun's position around its daily (apparent) orbit. Measured westward from local noon, it increases at a rate of 15° per hour. Thus 3pm (Local Apparent Time) is 45° and 9 am is -45°.
Hour Angle The angle, measured westwards around the celestial equator, between the observer's meridian and the hour circle of an object.
Hour Angle
the telescope based coordinate specifying the angle, in the equatorial plane, from the meridian to a plane containing the celestial object and the north and south celestial poles.
H-R Diagram ...
Hour Angle
Angular distance on the celestial sphere measured westward along the celestial equator from the meridian to the hour circle that passes through a celestial object.
Hour Circle ...
Hour Angle -- The angular distance of a celestial object measured westward along the celestial equator from the zenith crossing. In effect, HA represents the RA for a particular location and time of day.
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Hour angle
The sidereal time that has elapsed since the object was on the meridian (hour angle west, positive) or until it will again be on the meridian (hour angle east, negative).
hour angle - (n.)
Of a celestial object as seen from a particular location, the difference between the local sidereal time and the right ascension (H.A. = L.S.T. - R.A.).
H-R diagram - (n.) ...
An hour angle referred to the ephemeris meridian. [S92]
Ephemeris Longitude
Longitude (see Longitude, Terrestrial) measured eastward from the ephemeris meridian. [S92]
Ephemeris Meridian ...
the hour angle system is fixed to the Earth like the geographic coordinate system ...
sidereal hour angle (SHI)
right ascension (RA, ),
Greenwich hour angle (GHA),
local hour angle (LHA) ...
sidereal hour angle (abbr SHA). Angular distance west of the vernal equinox; the arc of the celestial equator, or the angle at the celestial pole, ...
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Sidereal time is defined as the hour angle of the vernal equinox. When the meridian of the vernal equinox is directly overhead, local sidereal time is 00:00.
These deposits will then appear slightly darker than they would if sunlight was directly reflected at the observer. If that same deposit were nearer to the noon hour angle then more sunlight would reflect back and it would appear brighter.
Information was acquired during the cislunar, the photo ellipse, and the extended mission (from end of the photographic mission to July 11, 1967) phases. Doppler, ranging, hour angle points, ...
 See also: Time, Earth, Hour, Second, Solar
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