apsis


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apsis

(pl. apsides), point in the orbitorbit,
in astronomy, path in space described by a body revolving about a second body where the motion of the orbiting bodies is dominated by their mutual gravitational attraction.
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 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 the apogee it is as far away as it gets, and it begins to move closer. Similarly, in the orbit of the earth or another planet around the sun, the perihelion is the point of closest approach and the aphelion is the point of farthest recession. In the orbit of the stars in a binary starbinary star
or binary system,
pair of stars that are held together by their mutual gravitational attraction and revolve about their common center of mass. In 1650 Riccioli made the first binary system discovery, that of the middle star in the Big Dipper's handle, Zeta
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 system, the periastron is the point of closest approach and the apastron the point of farthest recession. A line connecting the two apsidal points of an elliptical orbit (e.g., the aphelion and perihelion) is called the line of apsides; it is the major axis of the ellipse. This line may precess because of gravitational influences of other bodies or relativistic effects.

apsis

[′ap·səs]
(astronomy)
In celestial mechanics, either of the two orbital points nearest or farthest from the center of attraction. Also known as apse.

apsis

The semicircular termination of any rectangular chamber; an apse.

apsis

1. either of two points lying at the extremities of an eccentric orbit of a planet, satellite, etc., such as the aphelion and perihelion of a planet or the apogee and perigee of the moon. The line of apsides connects two such points and is the principal axis of the orbit
2. another name for apse
References in periodicals archive ?
In addition, APSIS enables operators to activate customers over the air and to download customized applications into the SIM card and into the mobile phone via the SMS (Short Message Service Channel).
LHS is a major global player for billing systems and with the formation of the new APSIS business unit, LHS will provide value-added applications for mobile operators and E-Commerce partners.
Coupled in the betting with the other Gary Tanaka-owned runner Eleusis, the 21-10 shot scored by a length and a half from Apsis, the Andre Fabre-trained favourite.
THE MOON (Times and dates are Universal Time) Phases Full Moon May 6, 3:34 Last Quarter May 13, 12:20 New Moon May 21, 14:06 First Quarter May 28, 18:21 Full Moon June 4, 13:02 Last Quarter June 12, 5:36 New Moon June 20, 1:52 First Quarter June 26, 22:43 Distances Apsis Distance Diameter Perigee May 4, |0.
30, 23:20 Distances Apsis Distance Diameter Apogee Dec.
APSIS and Martaline give Khalid Abdullah a strong hand in the Group 2 Prix du Conseil de Paris at Longchamp today, when their rivals include British raider Frank Sonata.
Coral: 11-4 Azamour, 5 Doyen, 13-2 Lucky Story, 7 Mister Monet, 9 Refuse To Bend, 10 Haafhd, 12 Norse Dancer, 14 Bachelor Duke (doubtful), 16 Ace, 25 Apsis, Gateman, Salselon, 33 Ecomium, Troubadour, 50 Imperial Dancer.
Coral: 11-4 Azamour, 5 Doyen, 13-2 Lucky Story, 7 Mister Monet, 9 Refuse To Bend, 10 Haafhd, 12 Norse Dancer, 14 Bachelor Duke, 16 Ace, 25 Gateman, Salselon, Apsis, 33 Ecomium, Troubadour, 50 Imperial Dancer.
Coral: 11-4 Azamour, 5 Doyen, 13-2 Lucky Story, 9 Refuse To Bend, Mister Monet, 10 Haafhd, Norse Dancer, 14 Bachelor Duke, 16 Ace, 25 Gateman, Salselon, Apsis, 33 bar.