An apsis (from Ancient Greek ἁψίς (hapsís) 'arch, vault'; pl. apsides /ˈæpsɪˌdiːz/ AP-sih-deez) is the farthest or nearest point in the orbit of a planetary...

from Latin absis, 'arch, vault'; from Ancient Greek ἀψίς, apsis, 'arch'; sometimes written apsis; pl.: apsides) is a semicircular recess covered with a hemispherical...

APSI (an abbreviation of "Agencia Publicitaria de Servicios Informativos") was a Chilean magazine aimed as means of political opposition to the Pinochet...

to be remarkable: a length of 58,5 metres on the inside, including the apsis, a width of 25 to 26 metres for the oblique north wall. Santa Maria del...

argument of periastron (for orbits around stars), and so on, may be used (see apsis for more information). An argument of periapsis of 0° means that the orbiting...

perspective in the Roman Emperor Constantine's Aula Palatina - Trier: The windows and the coffer in the apse are smaller, and the apsis has a raised floor....

explained in 2011 that he based calculations on 90% of the difference in lunar apsis extremes for the solar year. In other words, a full or new moon is considered...

Part of a series on Astrodynamics Orbital mechanics Orbital elements Apsis Argument of periapsis Eccentricity Inclination Mean anomaly Orbital nodes Semi-major...

Look up apogee in Wiktionary, the free dictionary. Apogee is a type of apsis: an extreme point in an object's orbit. Apogee may also refer to: Apogee...

Look up perigee in Wiktionary, the free dictionary. Perigee is a type of apsis: an extreme point in an object's orbit. Perigee may also refer to: Perigee:...