See also:great circle of the
See also:earth, equidistant from the two poles, which divides the
See also:northern from the
See also:southern hemisphere and lies in a
See also:plane perpendicular to the
See also:axis of the earth; this is termed the "
See also:geographical " or " terrestrial equator." In astronomy, the "
See also:celestial equator " is the name given to the great circle in which the plane of the terrestrial equator intersects the celestial sphere; it is consequently equidistant from the celestial poles . The " magnetic equator " is an imaginary
See also:line encircling the earth, along which the vertical component of the earth's magnetic force is zero; it nearly coincides with the terrestrial equator .
EQUATION OF TIME
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