hour angle


Also found in: Thesaurus, Acronyms, Encyclopedia, Wikipedia.

hour angle

n. Abbr. ha
The angular distance, measured westward along the celestial equator, between the celestial meridian of the observer and the hour circle passing through a celestial body.

hour angle

n
(Astronomy) the angular distance along the celestial equator from the meridian of the observer to the hour circle of a particular celestial body

hour′ an`gle


n.
the angle, measured westward through 360°, between the celestial meridian of an observer and the hour circle of a celestial body.
[1830–40]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.hour angle - the angular distance along the celestial equator from the observer's meridian to the hour circle of a given celestial body
distance - the property created by the space between two objects or points
2.hour angle - (astronomy) the angular distance of a celestial point measured westward along the celestial equator from the zenith crossing; the right ascension for an observer at a particular location and time of day
astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
angular distance - the angular separation between two objects as perceived by an observer; "he recorded angular distances between the stars"
Translations
References in periodicals archive ?
The solar hour angle w can be calculated from the following:
This equals the solar hour angle of 38[degrees] which means that the flat plate solar collector does not start working before 10 am in the morning and after 4 pm during the month of January.
By this stage in your program the ephemeris hour angle H of the computed geographical longitude [lambda] will have been found.
For this, you need the Local Hour Angle (LHA), which is simply the GHA minus your longitude (for the Western Hemisphere).
The hour angle at sunrise or sunset on an inclined surface [omega]st will be lesser than the value obtained by equation.
Daily extraterrestrial radiation on a horizontal surface H0 can be calculated as a function of the solar constant ([I.sub.sc]), the latitude of the site ([lambda]), the eccentricity correction factor of the Earth's orbit ([E.sub.0]), the solar declination ([delta]) and the mean sunrise hour angle ([w.sub.s]); using the equation
The direct radiation is empirical established depending on the extraterrestrial radiation, the medium solar constant, the day number during a year, the distortion factor, the solar altitude angle, the solar declination, the latitude angle, the solar hour angle, and the local solar time.
In Figure 10, angle T is the hour angle measured from the north-south line around the equatorial dial.