CELNAVTERM - Parallel of Latitude(Parallel Circle of...

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Parallel of Latitude (Parallel, Circle of Longitude) A circle on the surface of the earth, parallel to the equator, and connecting points of equal latitude. Parallel of Altitude (Circle of Equal Altitude) A circle of the celestial sphere parallel to the horizon, connecting all points of equal altitude. Parallel of Declination (Celestial Parallel, Circle of Equal Declination) A circle of the celestial sphere parallel to the celestial equator. Meridian Altitude The altitude of a celestial body when it is on the celestial meridian of the observer, bearing 000 or 180 true. GHA (Greenwich Hour Angle) Angular distance west of the Greenwhich celestial meridian; the arc of the celestial equator, or the angle at the celestial pole, between the upper branch of the Greenwich celestial meridian and the hour circle of a point on the celestial sphere, measured westward from the Greenwich celestial meridian through 360. LHA (Local Hour Angle) Angular distance west of the local celestial meridian. SHA (Sidereal Hour Angle) Angular distance west of the vernal equinox. Right Ascension Angular distance east of the vernal equinox. Meridian Angle Angular distance east or west of the local celestial meridian; the arc of the celestial equator, or the angle at the celestial pole, between the upper branch of the local celestial meridian and the hour circle of a celestial body measured eastward or westward
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