celestial+equator
41galactic equator — noun : the great circle of the celestial sphere halfway between the galactic poles parallel to and about 1 degree north of the center line of the Milky Way and inclined about 62 degrees to the celestial equator …
42Magnetic equator — Equator E*qua tor, n. [L. aequator one who equalizes: cf. F. [ e]quateur equator. See {Equate}.] 1. (Geog.) The imaginary great circle on the earth s surface, everywhere equally distant from the two poles, and dividing the earth s surface into… …
43galactic equator — noun Astronomy the great circle of the celestial sphere passing as closely as possible through the densest parts of the Milky Way …
44QQ' — • celestial equator …
45celestialequator — celestial equator n. A great circle on the celestial sphere in the same plane as the earth s equator. Also called equinoctial, equinoctial circle. * * * …
46Longitude — For Dava Sobel s book about John Harrison, see Longitude (book). For the adaptation of Sobel s book, see Longitude (TV series). Map of Earth Longitude (λ) Lines of longitude appear vertical with varying curvature in this projection, but are… …
47astronomical map — Introduction any cartographic representation of the stars, galaxies, or surfaces of the planets and the Moon. Modern maps of this kind are based on a coordinate system analagous to geographic latitude and longitude. In most cases, modern… …
48Equinox — This article is about the astronomical event when the sun is at zenith over the Equator. For other uses, see Equinox (disambiguation). For the same event happening on other planets and setting up a celestial coordinate system, see Equinox… …
49Sundial — A sundial is a device that measures time by the position of the Sun. In common designs such as the horizontal sundial, the sun casts a shadow from its style (a thin rod or a sharp, straight edge) onto a flat surface marked with lines indicating… …
50Precession (astronomy) — In astronomy, precession refers to the movement of the rotational axis of a body, such as a planet, with respect to inertial space. In particular, it refers to the precession of the Earth s rotational axis, also called the precession of the… …
