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252 Index

Altai, Rupes, 27 Blinking Planetary, 134-135 26-28, 35-36 altitude, 19 BM Orionis, 53, 55 Cyrillus (crater), 27, 29 Index Andromeda , 101, BM Scorpii, 157 Danjon, André, 38 175, 176-177, 179, Bonpland (crater), 33 dark side of Moon, 24, 33 1 Arietis, 181 201, 217, 229 books, 6, 243 Dawes (crater), 28 2 Canum Venaticorum, 113 Antares, 24, 40, 47, 119- Brocchi’s Cluster, 139 de Fontanay, Jean, 232 2 , 85 120, 151, 208 Burg (crater), 28, 30 Delta Cephei, 196-197 6 (Iota) Trianguli, 180-181 Apennines, 30, 31, 32, 37 Burnham, Sherburne, 7 Delta Herculis, 121 , 70 aperture, 5, 12, 18, 20, Burnham 1, 188, 189 Delta Orionis, , 58 15 Aquilae, 141 21, 244, 245 BZ Crucis, 237 Deneb, 91, 118-119 15 Geminorum, 73 aphelion, 45 Callisto, 41, 43 dew, 15, 17, 65, 91, 16 Cygni, 134-135 Apollo 11, 26, 28, 29 Cameron (crater), 26, 27 118, 162, 244 24 Cancri, 92-93 Apollo 12, 33 Caroline Herschel (crater), 33 dew cap, 15 24 Ophiuchi, 150-151 Apollo 14, 33 Carpathian Mts., 33 diffraction spike, 59, 245 , 68, 70 Apollo 15, 32, 37 Cassegrain, 18 diffuse , 8, 32 Orionis, 58-59 Apollo 17, 27, 28, 35 Cassini division, 20, 42, 43 10, 55, 249 36 Ophiuchi, 150-151 apparent field, 20, 21 Cassiopeia double , 188 Dobson, John, 18 39 Eridani, 60 Arago (crater), 29 Cassiopeia open Dobsonian, 5, 8, 12, 42 Orionis, 58 arc second, 11, 20 clusters, 190-195 15-21, 242, 245 , 212-213 Archimedes (crater), 31, 32 Castor, 40, 51, 74-75 dorsa, 25, 27 51 Pegasi, 165 Argaeus, Mons, 27, 28 catadioptric, 5, 12-18, Double Cluster, 186-187 52 Orionis, 58 Ariadaeus, Rima, 28 21, 242, 244, 245 double , 7-11, 246-247 , 97 Ariel, 48 catalogs, 7, 8, 243 Double-double, 4, 129, 151 54 Leonis, 100-101 Aristarchus (crater), Catharina (crater), 27-29 Double-double’s double, 129 56 Andromedae, 180-181 24, 34-37 Cauchy (crater), 27 DU Crucis, 237 , 97 Aristillus (crater), 30 Centaurus-A, 239 Dumbbell Nebula, 59 Andromedae, 180-181 Aristoteles (crater), 28 Cepheid variable (defined), 99, 136-137 61 Cygni, 128-129 Armstrong (crater), 29 177, 197; (examples) Dunlop 159, 232-233 AAVSO, 243 Arzachel (crater), 31 145, 197, 203, 227 Earthshine, 24, 26 Achird, 188-189 Ascella, 160 Chang’e 3, 27, 33 eclipses, 23, 38-39, 43 Acrab (Graffias), 151 Asperitatis, Sinus, 26-29 Chi Persei, 187 eclipsing binaries (variable Acrux, 208, 232-233 asteroids, 13, 40, 49, 242 Clavius (crater), 32-33 stars), 53, 71, 183, 188 AD Persei, 187 Atlas (crater), 27, 28 cleaning lenses, 17, 242 ecliptic, 24, 40-41, 44-45 Adhara, 83, 87 AU (), 57 clock drive, 19, 203, 256 ejecta, 25, 30, 31, 34, 35 Albireo, 4, 132-133 Autolycus (crater), 31 Clown Face Nebula, 74-75 Epsilon Boötis, Izar, 117 Alcor, 206-207 averted vision, 69, 101, 123 clusters: see galaxy, globular Epsilon Hydrae, 95 Algieba, 96-97 azimuth, 19, 205 clusters, open clusters Epsilon Lyrae, 129 Algol, 182-183 Barlow, 5, 11, 244, 245 Coal Sack, 236-237 Epsilon Monocerotis, 77 aligning Dobsonian balance, telescope, Coat Hanger, 138 Epsilon Sagittae, 139 mirrors, 16-17, 244 19, 244, 245 Cobra’s Head (crater), 35 Epsilon Volantis, 217 Alkalurops, 116-117 basin, 22, 24, 29, 36-37 Cognitum, Mare, 33 equatorial mount, 19, 203 Almach, 180-181 Beehive, 8, 92-93, 96; see collimation, 16-17, 244 Eratosthenes (crater), 32, 37 , 58 also Southern Beehive Collinder 399, Coat Eta Carinae, 228-229 Alpha Canis Majoris, belts, 41, 42, 43 Hanger, 139 Eta Cassiopeiae, Achird, 188 , 7 Bessel (crater), 30 coma, 21-22, 93, 244, 245 Eta Lupi, 150 Alpha Centauri, best seen, 10 Comet’s Tail (lunar , 58-59 Kentaurus, 233 Beta Cygni, Albireo, feature), 35 Euclides (crater), 33 Alpha Circini, 232-233 132-133 comets, 7-8, 13, 40, 49, Eudoxus (crater), 28, 30-31 Alpha Crucis, Acrux, 233 Beta Monocerotis, 78-79 116, 232, 242 Europa, 41, 43 Alpha Geminorum, Beta Muscae, 232-233 computers, 12-13, 242-243 exit pupil, 21 Castor, 74-75 Beta Orionis, Rigel, 58 , 6; see eyepiece, 9-10, 17, 20- Alpha Herculis, Beta Scorpii, 151; see Copernicus (crater), 21, 244-245 Rasalgethi, 124-125 Acrab (Graffias) 24, 32-37 eyepiece power, 9, 20-21 Alpha Scorpii, Antares, 151 , 215 Cor Caroli, 112-113 f ratio, 20-21, 245 Alpha Ursae Minoris, Big Bang, 103, 109, Cordillera, 37 False Cross, 208- Polaris, 203 123, 197 Crab Nebula, 8, 9, 66-67 209, 222-228 Alphonsus (crater), 31, 33 binoculars, 5, 8, 12, 24, 38 craters, 22, 25 Fecunditatis, Mare, 23, Alpine Valley, 31 Birt (crater), 31, 37 crescent Moon, 26-27 26-28, 35, 36 alt-azimuth mount, 18, 19 , 110-111 Crisium, Mare, 22, festoons, 42

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Index 253

field of view, 5, 9-12, Heis (crater), 33 Kuiper (crater), 23, 33 M32, 176-177 19-21, 244-245 Helicon (crater), 33 Kuiper, Gerard, 23, 117 M33, Triangulum filter, 8, 10, 43, 244, 245 Helix Nebula, 172-173 KV Aquarii, 173 Galaxy, 178-179 finderscope, 10, 12- Heraclides, Promontorum, 33 La Superba, 112-113, 141 M34, 182-183 15, 38-39, 244 Hercules (crater), 27, 28 Lagoon Nebula, 146-147 M35, 8, 72-73 finderscope view, 10 Herodotus (crater), 34, 35 Lambda Arietis, 180-181 M36, 68-71 first quarter, see half Moon Herschel 3945, Winter Lambda Geminorum, 75 M37, 68-71 Flamsteed number, 6 Albireo, 86-87 Lambda Orionis, 58, M38, 68-71 focal length, 11, 20-21 Herschel, Caroline, 167; see M39, 133 focal point, 18, 20-21 crater, 33 Lamont (crater), 29 M41, 82-83 Fra Mauro (crater), 33 Herschel, John, 8, 237 Lansberg (crater), 33, 34 M42, , 52-55 Frigoris, Mare, 28, 30-32 Herschel, William, 8, Langrenus (crater), 27 M43, 52-55 full Moon, 22, 23, 25, 54, 99, 167, 197 Large Magellanic Cloud, M44, Beehive, 92-93 36-37, 38, 244 highlands, 22, 25, 31, 35 9, 216-221 M45, Pleiades, 64-65 FZ Persei, 187 Hipparcos, 7, 83, 139 latitude, 6, 10, 19, 35, 37, M46, 84-85 galaxy, 8, 109, 250-251; HJ 1123, 183 90, 118, 121, 143, 149, M47 (NGC 2422), 84-85 group, 109, 201; cluster, HJ 2155, 183 158, 171, 205, 208, 256 M49, 106, 109 supercluster, 101, 109 HN 40, 149 le Monnier (crater), 27 M50, 80-81 Galileo, 18, 39, 54 HN 84, 139 le Verrier (crater), 33 M51, Whirlpool, 204-205 Gamma Andromedae, Homunculus, 229 lens caps, 17, 244 M52, 191 Almach, 180 Horse and Rider (Mizar lenses, cleaning, 17, 242 M53, 110-111 , and Alcor), 206 libration, 24, 26, 30-37 M54, 160-161 Mesarthim, 180 Hubble, Edwin, 177, 197 light (defined), 57 M55, 160-161 Gamma Crucis, Gacrux, 232 Hubble constant, 123 limb (defined), 22 M56, 132-133 Gamma Delphini, 128-129 , Local Group, 109, M57, Ring, 130-131 Gamma Leonis, Algieba, 97 143, 197, 229 175, 177, 179 M58, 106-107, 109 Gamma Velorum, 222-223 Huggins, William, 199 Longomontanus (crater), 33 M59, 106-107, 109 Gamma Virginis, Humorum, Mare, 24, 35, 36 LY Aurigae, 71 M60, 106-107, 109 Porrima, 104 Hyginus (crater and M1, Crab Nebula, 8, 66-67 M62, 154-155 Gamma Volantis, 217 rille), 25, 31 M2, 166-167 M63, Sunflower, 113 Ganymede, 41, 43 I 2391, 222-223 M3, 114-115 M64, Black Eye, 110-111 Gassendi (crater), 35 IC 2602, Southern M4, 152-153 M65, 100-101 Gem (cluster), 228-230 Pleiades, 231 M5, 124-125 M66, 100-101 Ghost of Jupiter, 8, 98-99 Imbrium, Mare, 24, M6, 156-157 M67, 94-95 gibbous Moon, 32-33, 46 26, 30-37 M7, 156-157 M71, 138-139 globular clusters, 8, internet, 12, 242; see web M8, Lagoon, 146-147 M72, 168-169 109, 115, 250 Io, 41, 43 M10, 126-127 M79, 62-63 Graffias, see Acrab Iota Boötis, 206 M11, Wild Ducks, 140-141 M80, 152-153 Great , , 96-97 M12, 126-127 M81, 200-201 8, 120 Iota Cassiopeiae, 188 M13, Great Globular, M82, 200-201 Great Red Spot, 41, 42 , Hatysa, 55 8, 120-121 M84, 106-107, 109 greatest elongation, 44, 45 Iota (6) Trianguli, 180 M15, 164-165 M86, 106-107, 109 Grimaldi (crater), 24, 36, 37 Iridum, Sinus, 32-33 M16, 142-143 M87, 106-107, 109 guideposts, 6 Izar, 116-117 M17, Swan, 142-143 M88, 106-107, 109 h Persei, Double Cluster, 187 J Velorum, 229 M18, 143 M89, 106-107, 109 h 3752, 63 Jabbah, 150-151 M19, 154-155 M90, 106-107, 109 h 4128, 225 Jansen (crater), 29 M20, Trifid, 148-149 M91, 106-107, 109 h 4432, 229 Jewel Box, 229, 236-237 M21, 148-149 M92, 122-123 Hadley Rille, 32, 37 Jupiter, 4, 5, 18, 40-43, 244 M22, 158-159 M93, 88-89 Haemus Montes, 30 Jura Mountains, 33 M23, 143-145 M94, 112-113 half Moon, 22, 30-31 k Puppis, 89 M24, 143, 145 M95, 102 Halley (comet), 49 Kappa Boötis, 206 M25, 143-145 M96, 102 Halley, Edmund, 239 Kappa Geminorum, 75 M26, 141 M98, 108, 109 Hamburger Galaxy, 239 Kappa Leonis, 96-97 M27, Dumbbell, 136-137 M99, 108, 109 Harbinger Mons, 34 Kappa Tucanae, 215 M28, 158-159 M101, Pinwheel, 206-207 harvest Moon, 37, 163 Kayuga (spacecraft), 35 M29, 133 M103, 194 Hatysa, 52-55 Kepler (crater), 24, 34-37 M30, 170-171 M105, 102-103 HD 160202, 157 Keyhole Nebula, 228-229 M31, Andromeda M110 (NGC 205), 176-177 HdO 290, 240 Kuiper Belt, 117 Galaxy, 176-177 magazines, 4, 7, 49, 243

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254 Index Magellanic Clouds, 8, 9, NGC 220, 210-211 NGC 1986, 217-221 NGC 4372, 234-235 109, 167, 177, 209-221 NGC 222, 210-211 NGC 1994, 217-221 NGC 4435, 106-109 Maginus (crater), 33 NGC 225, 190-192 NGC 2001, 217-221 NGC 4438, 106-109 magnification, 9, 11, NGC 231, 210-211 NGC 2009, 217-221 NGC 4461, 106-107, 109 18, 20-21 NGC 247, 174-175 NGC 2014, 217-221 NGC 4469, 106-107, 109 magnitude (scale), 6 NGC 249, 210-211 NGC 2015, 217-221 NGC 4473, 106-107, 109 Maksutov, 18, 20 NGC 253, 174-175 NGC 2031, 217-221 NGC 4477, 106-107, 109 Manilius (crater), 30 NGC 261, 210-211 NGC 2032, 217-221 NGC 4526, 106-107, 109 Manners (crater), 29 NGC 265, 210-211 NGC 2033, 217-221 NGC 4535, 106-107, 109 mare, 22, 25 NGC 281, Pacman, 189 NGC 2042, 217-221 NGC 4638, 106-107, 109 Marginis, Mare, 26 NGC 288, 174-175 NGC 2044, 217-221 NGC 4754, 105, 109 Marius (crater, hills, NGC 330, 210-211 NGC 2048, 217-221 NGC 4755, Jewel Box, 236 rille), 35 NGC 346, 210-211 NGC 2055, 217-221 NGC 4762, 105, 109 Mars, 119, 125, 40- NGC 362, 214-215 NGC 2060, 217-221 NGC 4833, 234-235 41, 46-47, 244 NGC 371, 210-211 NGC 2070, Tarantula, NGC 4945, 238 Maskelyne (crater), 29 NGC 376, 210-211 216-221 NGC 5053, 111 Maskelyne G (crater), 29 NGC 395, 210-211 NGC 2074, 217-221 NGC 5128, 239 Menelaus (crater), 30, 36 NGC 419, 210-211 NGC 2077, 217-221 NGC 5139, Omega Mercury, 39, 40-41, 44-45 NGC 436, 192-193 NGC 2079, 217-221 Centauri, 238 Mesarthim, 180-181 NGC 456, 210-211 NGC 2080, 217-221 NGC 5189, Spiral Messier (crater), 27, 35 NGC 457, 192-193 NGC 2081, 217-221 Planetary, 234 Messier A (crater), 27, 35 NGC 458, 210-211 NGC 2086, 217-221 NGC 5195, 204-205 Messier Catalog, 7, 67, 243 NGC 460, 210-211 NGC 2098, 217-221 NGC 5286, 239 Messier, Charles, 7, 18, 35, NGC 465, 210-211 NGC 2100, 217-221 NGC 6207, 121 67, 85, 143, 167, 205 NGC 604 in M33, 179 NGC 2103, 217-221 NGC 6229, 123 Messier marathon, 171 NGC 637, 194-195 NGC 2122, 217-221 NGC 6530, 146-147 Milky Way, 8, 63, 90, 101, NGC 654, 194-195 NGC 2129, 73 NGC 6543, Cat’s Eye, 198 109, 118-119, 133, NGC 659, 194-195 NGC 2158, 73 NGC 6544, 147 162-163, 177, 208-209; NGC 663, 194-195 NGC 2232, 78-79 NGC 6553, 147 see also Local Group NGC 752, 179, 181 NGC 2244, 76-77 NGC 6744, 241 Mintaka, 58-59 NGC 869, Double NGC 2362, 86-87 NGC 6752, 240-241 Miram, 186 Cluster, 186-187 NGC 2392, Clown NGC 6826, Blinking Mirfak star field, 182-183 NGC 884, Double Face, 74-75 Planetary, 134-135 Mirzam, 83 Cluster, 186-187 NGC 2414, 85 NGC 7009, Saturn Mizar, 206-207, 232 NGC 1535, 60-61 NGC 2422, 85 Nebula, 168 Moltke (crater), 29 NGC 1711, 217-221 NGC 2423, 85 NGC 7293, Helix, 172 Moon, 22-38 NGC 1727, 217-221 NGC 2438, 85 NGC 7789, 190-191 Mortis, Lacus, 28, 30 NGC 1743, 217-221 NGC 2516, 224-225 North Star, Polaris, 202 Mu Boötis, Alkaurops, 117 NGC 1755, 217-221 NGC 2547, 222-223 Nu Scorpii, Jabbah, 151 Mu Canis Majoris, 81 NGC 1786, 217-221 NGC 2808, 226-227 Nubium, Mare, 24, 31, 36-37 Mu Cephei, Garnet NGC 1835, 217-221 NGC 2976, 201 Oberon, 48 Star, 196-197 NGC 1837, 217-221 NGC 3077, 201 objective (lens or mirror), Mu Crucis, 232-233 NGC 1845, 217-221 NGC 3114, 227 18, 20-21, 39, 244 mutual events, 43 NGC 1847, 217-221 NGC 3242, Ghost of occultation, 24, 38, 43 N Centauri, 238-239 NGC 1850, 217-221 Jupiter, 98-99 Omega Aurigae, 70 naked-eye charts, 10, 13 NGC 1854, 217-221 NGC 3293, Gem, 228-230 Omega Centauri, 121, nebula filter, 8, 10, 55, 99, NGC 1856, 217-221 NGC 3372, Keyhole, 228 158, 208, 213, 215, 244; see also filters NGC 1858, 217-221 NGC 3384, 103 238-239, 241 Nectaris, Mare, 23, 24, NGC 1872, 217-221 NGC 3389, 103 Omicron Ophiuchi, 150-151 26-28, 33, 36 NGC 1874, 217-221 NGC 3412, 103 Omicron-2 Eridani, Neptune, 13, 18, 40, NGC 1901, 217-221 NGC 3532, Wishing Keid, 60-61 48-49, 61, 242 NGC 1910, 217-221 Well, 229-230 open clusters, 8-9, 55, 71, New General Catalog, 7 NGC 1934, 217-221 NGC 3607, 100-101 95, 244, 248-249 new Moon, 22, 24 NGC 1962, 217-221 NGC 3608, 100-101 opera glasses, 12 Newtonian, 11-12, 15, NGC 1967, 217-221 NGC 3628, 100-101 opposition, 43, 46-47, 48-49 18-21, 205, 245 NGC 1974, 217-221 NGC 3632, 100-101 optical double, 129, 233 NGC 104, 47 Tucanae, 212 NGC 1980, 53 NGC 3766, Pearl, Orientale Basin, 37 NGC 129, 192-193 NGC 1981, 53 227-229, 231 Orion Nebula, 7, 8, 9, NGC 188, 202-203 NGC 1983, 217-2216 NGC 4216, 108-109 52-55, 57, 58-59,

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Index 255 71, 79, 217, 229 Rhaeticus (crater), 31 Star Trek, 61 Theta-2 Orionis, 54-55 Otto Struve 44, 183 Rhea, 43 starburst galaxy, 175 Thuban, 203 Otto Struve 525, 131 Rho Cassiopeiae, 190 , 147, 223 Titan, 41, 43 Pacman Nebula, 189 Rho Herculis, 123 storing (equipment), 16, 244 Titania, 48 Parry (crater), 33 Rho Persei, 183 Straight Wall, 31, 37 Toricelli (crater), 29 Pearl (cluster), 227-229, 231 Richaud, Jean, 232 Struve 118, 66 Tranquillitatis, Mare, penumbral eclipse, 38 Rigel, 50-51, 58-59, 163 Struve 131, 194 24, 26-30, 35, 36 Peirce (crater), 26 Rigel Kentaurus, Struve 153, 195 Tranquility Base, 29 Petavius (crater), 27 208, 232-233 Struve 163, 188 transits, 39, 42-43, 45 phases, 5, 18, 22-25, 44 rilles, 25, 35 Struve 742, 65-66 Trapezium, 52-55 Phi-2 Cancri, 97 Ring Nebula, 8, 99, 130-131 Struve 745, 54-55 Triangulum Galaxy, 109, Pi Boötis, 117 rings, 18, 20, 24, 42-43 Struve 747, 54-55 177, 178-179 Picard (crater), 26 Riphaeus Mts., 33 Struve 761, 56-57 Triesnecker (crater, Pico, Mons, 31 Ritter (crater), 29 Struve 1083, 75 dorsa), 31 Pinwheel Galaxy, Rook Mts., 37 Struve 1108, 75 Trifid Nebula, 148-149 109, 206-107 Rosette, 76-77, 244 Struve 1266, 97 twinkle, 40-41, 47 planetary nebulae 9, 10, Ross (crater), 29 Struve 1685, 110 Tycho, 24, 25, 30-33, 35, 36 20, 99, 48, 244, 250 Rosse, Lord (William Struve 1689, 105 U Sagittarii, 145 planets, 5-6, 9, 13, 21, Parsons), 205 Struve 1702, 113 umbral eclipse, 38 24, 39, 40-49, 115, RR Scorpii, 155 Struve 1795, 206 Umbriel, 48 242-243, 244 Rumker 8, 225 Struve 1999, 151 Upsilon Andromedae, 181 Plato (crater), 31 RZ Cassiopeiae, 188 Struve 2391, 141 Upsilon Carinae, 227 Pleiades, 64-65 Sabine (crater), 29 Struve 2470, D-D’s Uranus, 13, 40, 48-48, 99 Plinius (crater), 28, 30 Saturn, 40-41, 42-43 double, 129 Ursa Major Group, 207 Pluto, 40, 48, 49 Saturn Nebula, 168-169 Struve 2474, D-D’s V Aquilae, 141 Polaris, 19, 202-203 Schmidt (crater), 29 double, 129 V1016 Orionis, 7, 53-54, 55 poles, 24-25, 42 Schmidt (telescope), 18 Struve 2725, 128-129 Vaporum, Mare, 30-31 Posidonius (crater), 27-30 Schröter effect, 44 Struve 2815, 197 , 7, 243, 251 prime focus, 18 Schröter’s Valley, 35 Struve 2816, 196-197 Venus, 39, 40-41, 43-44 Prinz (crater), 34 Secchi, Angelo, 113 Struve 2819, 196-197 VZ Cancri, 7, 94-95 Procellarum, Oceanus, Serenitatis, Mare, 24, Struve 3053, 188-189 waning Moon, 22, 37 22, 24, 35-38 27-31, 35, 36 Struve, Friedrich, 7 web, 13-14; see internet Proclus (crater), 36 Seven Sisters, see Pleiades Struve, Otto, 7 what, where and when Procyon, 51, 61, 81, 90 SETI, 61 SU Cassiopeiae, 188 to look, 256 projection, 39 Sheliak, 131 Summer Triangle, 91, 118, Whirlpool Galaxy, Propus, 73 Schiller (crater), 35 128-129, 162, 185 109, 204-205 Proxima Centauri, 57, 232 Sidus Ludovicianum, 207 , 39, 243-245 white dwarf, 61, 99, 135 Psi Draconis, 199 Sigma Cassiopeiae, 188-189 sunspots, 39 Wild Ducks, 140-141 Ptolemaeus (crater), 31 Sigma Coronae Borealis, 121 superclusters, 103, 109 Winter Albireo, 86-87 pulsar, 67 , 56-57 supernova, 8, 9, 66-67, 71, Wishing Well, 229-230 Putredinis, Palus, 32 Sinus Medii, 30-31 115, 190, 213, 229 Wolf–Rayet stars, 223 Puzzle (Mizar & Alcor), 206 Sirius, 6, 7, 51, 61, 81, 83 Swan Nebula, 8, 142-143 X-rays, 76, 79, 165 Q Centauri, 238-239 sky conditions, 5, 7-8 Syrtis Major, 46 Xi Boötis, 117 R Cygni, 135 Small Magellanic T-Tauri stars, 147 Xi Lupi, 151 R Scuti, 141 Cloud, 210-211 tables, 246-251 Xi Pavonis, 241 Ranger 7 and 9, 33 Smirnov, Dorsa, 27, 28 Tarantula Nebula, Xi Scorpii, 151 Rasalgethi, 121, 124-125 Smythii, Mare, 26 179, 216-218 Y Canum Venaticorum (Y ratings, 8-9, 243 Somniorum, Lacus, 28, 30 Taruntius (crater), 26-27 CVn), La Superba, 113 rays, 24, 25, 27, 34-36 Southern Highlands, 27-36 Taurus–Littrow, lunar , Tegmine, 92-93 (definition), 71 Southern Pleiades, 228, 231 valley, 27 Zeta Coronae Borealis, 117 reflector, 17, 18, 20-21 spectral class (described), 71 telescope view, 10, 13, 21 Zeta Lyrae, 129 refractor, 4, 5, 12-16, spectroscopic binary, Telrad, 244 Zeta Orionis, Alnitak, 58 18, 20-21, 245 135, 180, 203, 232 Teneriffe Mts., 31 Zeta Sagittae, 139 Regulus, 40, 51, 90, spider, 17, 245 terminator, 22-23 Zeta Ursae Majoris, 97, 180, 208 Spiral Planetary, 234 Tethys, 43 Mizar, 206-207 Reiner (crater), 34, 35 Stadius (crater), 32 Tharsis, 46 Zeta Volantis, 217 Reinhold (crater), 33, 34 standard candle, 197 Theophilus (crater), 27, 29 zodiac, 24, 40-41 resolution, 15, 20-21 star diagonal, 5, 10-12, Theta Sagittae, 139 zones, 40-43 Rey, H. A., 6, 243 13, 15, 242, 244-245 Theta-1 Orionis, 55 ZZ Carinae, 227

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