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abstraction > mathematical concept > geometrical object > point > coordinate > equatorial coordinate |
equatorial coordinate comparison table |
Subject | has right ascension | has definition | is part of | is opposite of | is a kind of | is an instance of |
---|---|---|---|---|---|---|
antapex | The direction in the sky away from which the Sun seems to be moving (at a speed of 19.4 km s-1) relative to general field stars in the Galaxy. | Columba | solar apex | equatorial coordinate | ||
celestial ephemeris pole | The reference pole for nutation and polar motion; the axis of figure for the mean surface of a model Earth in which the free motion has zero amplitude. This pole has no nearly diurnal nutation with respect to a space-fixed or Earth-fixed coordinate system. | equatorial coordinate | ||||
celestial pole | 0 | One of two points at which the Earth's axis of rotation, if extended, would intersect the celestial sphere. | equatorial coordinate | |||
solar apex | A point on the celestial sphere toward which the Sun and the solar system are moving with respect to the local standard of rest at a rate of about 19.4 km per second (about 4.09 AU per year). | Hercules | antapex | equatorial coordinate |
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