Apsis

An apsis (Greek ἁψίς, gen. ἁψίδος), plural apsides (z; Greek: ἁψίδες), is a point of least or greatest distance of a body in an elliptic orbit about a larger body. For a body orbiting the Sun the least distance and greatest points are called respectively perihelion (n) and aphelion and (n), whereas for any satellite of Earth inc...
Found on http://en.wikipedia.org/wiki/Apsis

Apsis

• (n.) In a curve referred to polar coordinates, any point for which the radius vector is a maximum or minimum. • (n.) One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee and perigee of...
Found on http://thinkexist.com/dictionary/meaning/apsis/

Apsis

Ap'sis (ăp'sĭs) noun ; plural Apsides (ăp'sĭ*dēz). See Apse . [ Latin apsis , absis , Greek 'apsi`s , 'apsi^dos , a tying, fastening, the hoop of a wheel, the wheel, a bow, arch, vault, from 'a`ptein
Found on http://www.encyclo.co.uk/webster/A/111

APSIS

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Found on http://www.encyclo.co.uk/local/20895

apsis

apsis (pl. apsides), point in the orbit of a body where the body is neither approaching nor receding from another body about which it revolves. Any elliptical orbit has two apsides. At the perigee the moon or other satellite is as close as it ever gets to the earth, and it begins to move away; at th...
Found on http://www.infoplease.com/ce6/sci/A0804432.html

apsis

Either of the points in the orbit of a celestial object that is farthest from or closest to the body being orbited. The closest point is the periapsis, the further point the apoapsis. The line joining these points is called the line of apsides, and is another name for the major axis of the orbit. Ro...
Found on http://www.daviddarling.info/encyclopedia/A/apsis.html

Apsis

In astronomy, an apsis is one of the two points of the orbit of a heavenly body situated at the extremities of the major axis of the ellipse formed by the orbit, one of the points being that at which the body is at its greatest and the other that at which it is at its least distance from its primary. In regard to the earth and the other planets, th...
Found on http://www.probertencyclopaedia.com/browse/GA.HTM

apsis

Origin: L. Apsis, absis, Gr, a tying, fastening, the hoop of a wheel, the wheel, a bow, arch, vault, fr. To fasten. ... 1. <astronomy> One of the two points of an orbit, as of a planet or satellite, which are at the greatest and least distance from the central body, corresponding to the aphelion and perihelion of a planet, or to the apogee an...
Found on http://www.encyclo.co.uk/local/20973
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