First Sentence:
All astronomical objects can be considered as lying on an imaginary sphere surrounding the Earth, called the celestial sphere (Figure 1).
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Key Phrases - Statistically Improbable Phrases (SIPs):
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elongation east, standard epoch, optical pair, binocular object, open cluster, apparent solar time, sporadic meteors, constellation boundaries, noctilucent clouds, star atlas, photoelectric photometry, combined magnitude, heliographic latitude, greatest elongation, secondary spectrum, globular cluster, emission nebulae, planetary nebula, comparison stars, diffuse nebulae, mean solar time, inferior conjunction, dwarf novae, orbital elements, secondary period
Key Phrases - Capitalized Phrases (CAPs):
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Solar System, Ursae Majoris, Milky Way, Great Red Spot, Pacific Ocean, Moon Total, Sun Partial, South America, Sun Annular, Atlantic Ocean, North America, Orion Nebula, Ursa Major, Canes Venatici, Indian Ocean, Kuiper Belt, Sun Total, Handbook of the British Astronomical Association, New Zealand, Andromeda Galaxy, International Astronomical Union, Local Group, The Astronomical Almanac, Universal Time, Virgo Cluster
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