Fourteen Weeks in Descriptive Astronomy |
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appear astronomers atmosphere attraction axis become body bright brilliant called cause celestial centre circle comet conjunction constellation continues dark Describe diameter direction discovered disk distance earth east ecliptic effect eight entire equal equator equinox fact fall feet figure fixed four gives globe half heat heavens horizon inclined increases inferior Jupiter known length less light marked Mars mean measured Mercury meridian miles minutes months moon motion move named nature nearly night noticed observer occur opposite orbit pass path perihelion period planet pole portion position present produced rays reach regions represented revolves ring rising Saturn seasons seen shadow side sidereal solar solstice space sphere stars summer sun's supposed surface telescope theory tion turned varies Venus visible winter