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observation 129-45 appearance of the sky 130-3

astrophotography 144-5 binoculars 138-9 coordinates 132 equipment 129 pole stars 134 size of objects 135 telescopes 129, 140-3 Octans (The Octant) 227 Octant (Octans) 227 October sky 266-9 Olympus Mons 105 Omega Centauri (NGC 5139)

75, 198, 198 Omega Nebula (M17) 201 Omicron Ceti (Mira) 189 Omicron-1 Cygni 165 Oort cloud 47, 121 opaque universe 51 Ophiuchus (The Serpent

Holder) 181 Orion (The Hunter) 190-1 Orion Nebula (M42) 190, 191 Owl Nebula (M97) 158, 159

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