uranology
41dec — noun (astronomy) the angular distance of a celestial body north or to the south of the celestial equator; expressed in degrees; used with right ascension to specify positions on the celestial sphere • Syn: ↑declination, ↑celestial latitude •… …
42ephemeris time — noun (astronomy) a measure of time defined by Earth s orbital motion; terrestrial time is mean solar time corrected for the irregularities of the Earth s motions • Syn: ↑terrestrial time, ↑TT, ↑terrestrial dynamical time, ↑TDT • Topics:… …
43equinoctial point — noun (astronomy) either of the two celestial points at which the celestial equator intersects the ecliptic • Syn: ↑equinox • Topics: ↑astronomy, ↑uranology • Hypernyms: ↑celestial point …
44extragalactic nebula — noun (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust extragalactic nebula is a former name for galaxy • Syn: ↑galaxy • Derivationally related forms: ↑galactic (for: ↑gal …
45go down — verb 1. move downward and lower, but not necessarily all the way (Freq. 11) The temperature is going down The barometer is falling The curtain fell on the diva Her hand went up and then fell again • Syn: ↑descend, ↑fall, ↑ …
46go under — verb 1. go under, The raft sank and its occupants drowned (Freq. 1) • Syn: ↑sink, ↑settle, ↑go down • Ant: ↑float (for: ↑sink) …
47hour angle — noun 1. the angular distance along the celestial equator from the observer s meridian to the hour circle of a given celestial body (Freq. 1) • Hypernyms: ↑distance 2. (astronomy) the angular distance of a celestial point measured westward along… …
48Hubble law — noun (astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer • Syn: ↑Hubble s law • Topics: ↑astronomy, ↑uranology • Hypernyms: ↑ …
49Hubble's law — noun (astronomy) the generalization that the speed of recession of distant galaxies (the red shift) is proportional to their distance from the observer • Syn: ↑Hubble law • Topics: ↑astronomy, ↑uranology • Hypernyms: ↑ …
50inclination of an orbit — noun (astronomy) the angle between the plane of the orbit and the plane of the ecliptic stated in degrees • Syn: ↑inclination • Derivationally related forms: ↑incline (for: ↑inclination) • Topics: ↑ …
