General astronomy

General astronomy

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General astronomy

mass

Astronomy; General astronomy

an intrinsic property of an object that measures its resistance to an acceleration. Mass is measured in units of kilograms.

mathematical models

Astronomy; General astronomy

a set of equations describing the structure and interaction of material in an object or group of objects.

mean Sun

Astronomy; General astronomy

imaginary object that moves uniformily eastward along the celestial equator such that it completes one 360° circuit of the sky in one year. The average solar day is the time between successive ...

great circle on the sky that goes through the celestial poles and the zenith point. It separates the daytime motions of the Sun into ``a.m.'' and ``p.m.''. The azimuth of an object on the meridian in ...

quasar

Astronomy; General astronomy

short for ``quasi-stellar radio source''. Quasars are the most luminous of active galaxies---they are the extremely active nuclei of otherwise normal galaxies. Quasars generate a huge amount of ...