Advanced Physiography |
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absorption angle angular appears astronomical atmosphere axis bright lines called carbon cause celestial sphere centre changes chromosphere circle colour comet dark lines density diameter direction disc distance earth earth's orbit ecliptic equator equatorial equinox fixed stars formed Fraunhofer lines heat heavenly bodies horizon hydrogen increase iron Jupiter known latitude length lens light longitude lunar magnetic Mars mass mean measured meridian metallic meteorites meteors miles minerals moon moon's motion move nearly nebula needle node northern hemisphere observed orbit parallax parallel particles passing perihelion period photosphere planet point of Aries pole position precession pressure prism produced proper motion radius rays reflected refraction revolution revolving right ascension rocks rotation round the sun satellites seen side sidereal sidereal day slit sodium solar spectrum spectra spectroscope spots sun's surface telescope temperature terrestrial tides tion Uranus vapour velocity Venus vernier vertical winds zenith