noun plural but singular or plural in construction
: the application of the methods of analytic mechanics to the determination of the motions of the celestial bodies under the action of gravitation — called also gravitational astronomy
noun plural but singular or plural in construction
: the application of the methods of analytic mechanics to the determination of the motions of the celestial bodies under the action of gravitation — called also gravitational astronomy
Webster's New International English Dictionary. Новый международный словарь английского языка Webster. 2012