Natural Philosophy: With an Explanation of Scientific Terms, and an Index, Τόμος 3

altitude apogee apparent diameter appear ascer ascertained astronomers axis called centre circle computed consequently continually corresponding course declination deduced degree diminished direction diurnal motion earth earth's surface east eclipse elevation equal equator equinox fixed stars globe greater greatest Greenwich heavenly body heavens Hipparchus horizon increases islands Kepler latitude length less longitude lunar manner mean measured meridian method miles moon moon's motion nautical nearly observed ocean orbit parallax parallel passing perigee period perpendicular plane portion position precession proper motion proportion Ptolemy quantity refraction remarkable represent respect revolution rhumb line right angled right ascension rotation round S₁ sailing seen shadow side sidereal sidereal day sine solar day solstice South species sphere spherical sun's supposed supposition Surya Siddhanta tables tained tance tangent temperature tion triangle tropical true tude varies vernal equinox visible whole winds zenith distance