noun
Etymology: mean (VII)
: a fictitious sun supposed to move uniformly along the celestial equator completing crossings of the vernal equinox at intervals of a tropical year
noun
Etymology: mean (VII)
: a fictitious sun supposed to move uniformly along the celestial equator completing crossings of the vernal equinox at intervals of a tropical year
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012