- Types:
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apex, apex of the sun's way, solar apex
the point on the celestial sphere toward which the sun and solar system appear to be moving relative to the fixed stars
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antapex
the point opposite in direction from the solar apex; the point the solar system is moving away from
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apoapsis, point of apoapsis
(astronomy) the point in an orbit farthest from the body being orbited
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node
(astronomy) a point where an orbit crosses a plane
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equinoctial point, equinox
(astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic
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culmination
(astronomy) a heavenly body's highest celestial point above an observer's horizon
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nadir
the point below the observer that is directly opposite the zenith on the imaginary sphere against which celestial bodies appear to be projected
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periapsis, point of periapsis
(astronomy) the point in an orbit closest to the body being orbited
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celestial pole, pole
one of two points of intersection of the Earth's axis and the celestial sphere
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zenith
the point above the observer that is directly opposite the nadir on the imaginary sphere against which celestial bodies appear to be projected
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exaltation
the location of a planet in the zodiac at which it is believed to exert its maximum influence
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apogee
apoapsis in Earth orbit; the point in its orbit where a satellite is at the greatest distance from the Earth
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aphelion
apoapsis in solar orbit; the point in the orbit of a planet or comet that is at the greatest distance from the sun
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apojove
apoapsis in orbit around Jupiter
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apolune, aposelene
apoapsis in orbit around the moon
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ascending node
the point at which an orbit crosses the ecliptic plane going north
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vernal equinox
(astronomy) the equinoctial point that lies in the constellation of Pisces
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autumnal equinox
(astronomy) the equinoctial point that lies in the constellation of Virgo
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descending node
the point at which an orbit crosses the ecliptic plane going south
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perigee
periapsis in Earth orbit; the point in its orbit where a satellite is nearest to the Earth
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perihelion
periapsis in solar orbit; the point in the orbit of a planet or comet where it is nearest to the sun
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perijove
periapsis in orbit around Jupiter
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perilune, periselene
periapsis in orbit around the moon