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Astronomy

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Astronomical distances Black hole Cassiopeia Celestial equator Celestial sphere Cepheid variables Comets Craters Cygnus Day and night Eclipses Ecliptic Epicycle theory Equinoxes Foucault 1 Foucault 2 Galactic red shift Helical path Hercules Hertzsprung Russell Kepler law 1 Moon globe Movement of the Plough Orbit of Venus Elongation Orion Perihelion of Mercury Period luminosity relation Perseus Phases of the Moon Retrograde motion Saturn Seasons Seasons - sunlight Solar and sidereal days Night Sky in December Night sky in June Sundial 1 Sundial 2 Telescope mountings Tides Ursa Major
 
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