A

A (Angstroms), 106 A ring (Saturn), 222 A.U.s (Astronomical Units),

59, 175 absolute brightness, stars,

absolute magnitude, stars,

absorption lines interstellar dust, 292 stellar spectra, 262 absorption spectrum, 114 accretion, 166, 168 active galaxies, 335, 338 Adams, John Couch, 210 aer, Anaximenes, 25 age dating, radioactive decay, 163 age of solar system, 171 Airy, George, 211 al-Battani, On Stellar

Motion, 48 Al-Sufi, Uranographia, 48 Alberio, 260 alchemy, 239 Aldebaran (star), 16, 270 Aldrin Jr., Edwin E. Buzz, 139

all sky star charts, 13 Almagest, 44, 48 Alpha Centauri (star), 14, 256

Alpheratz (star), 14 Altair (star), 14 altazimuth coordinate system, 9

altitude, 9, 210 AM radio, frequency and wavelength, 109 amateur radio astronomy, 126

amateur reflector telescopes, 86 amateur refracting telescopes, 85 amateur telescopes. See also telescopes costs, 87-89 shopping, 89

Dobsonian telescopes,

92-93 Maksutov-Cassegrain telescopes, 91-92 reflector telescopes, 90

refractor telescopes,

89-90 rich-field telescopes, 90

Schmidt-Cassegrain telescopes, 90-91 American moon exploration, 137 amino acids, 346 amplitude, light waves, 103

Anaxagoras, solar eclipses, 26

Anaximander, apeiron and cosmology, 25 Anaximenes, aer, 25 Andromeda, distance from

Earth, 66 Andromeda Galaxy, 307,

Angstroms, 106 angular momentum, 165 angular resolution, telescopes, 75, 122 angular separation, 10 angular size, 10 angular velocity, stars, 257 annihilation, electrons and positrons, 364 Antares (star), 14 antielectrons, 364 apeiron, 25 Apennine Mountains, moon, 153 aperture, binoculars, 82-84 Aphrodite Terra, Venus, 195

apogee, sun, 48 Apollo asteroids, 180 Apollo lunar missions, 138 Apollo 11, first landing on moon, 139 Command Module, 138 Lunar Module, 138 apparent brightness, stars,

apparent magnitude, stars,

Aquila (constellation), 14 Arabic astronomy, 48 arcminutes, 10 arcseconds, 10 Arcturus (star), 13, 270 Arecibo, radio telescope,

122, 125 Arecibo Message, 358 Ariel, Uranus' moon, 211, 231

Aries (constellation), 15 Aristarchus, heliocentric solar system, 26 Aristotle, gerocentric model of universe, 42 arms, spiral galaxies, 323 Armstrong, Neil A., first man on moon, 139 Aryabhatta, 47 ashen light phenomenon,

Venus, 21 assumption of mediocrity,

345 asterisms

Big Dipper, 12 Great Square, 14 Hyades, 16 Little Dipper, 12 Milk Dipper, 14 Northern Cross, 14 Orion's Belt, 15 Sickle, 13 Teapot, 14 asteroid belt, 164, 168 asteroids, 164, 174, 178 Apollo, 180 Ceres, 174 composition, 179 Ida, 179 Pallas, 174 planetoids, 174 astrology, 11 astrometry, 351 astronauts, 138 astronomers, 117 astronomy gamma ray astronomy, 129

historical overview, 17 infrared astronomy, 129 radio astronomy, 117 ultraviolet astronomy, 129

Astronomy or Sky & Telescope, 95

astrophotography, 95-96 atmosphere

Earth, early era, 346 jovian planets, 209 Jupiter, 217 Neptune, 218 opacity, 109 optical window, 109 radio window, 109 Saturn, 218 Uranus, 218 Venus, 196 atomic particles, electromagnetic radiation, 105 atoms component particles,

104 creation, 366 electrons, hydrogen, 113 protons, hydrogen, 113 Auriga (constellation), 15 aurora, 243 Aurora Australis, 244 Aurora Borealis, 244 autumn, star visibility, 14 autumnal equinox, 24, 39 average density, planets, 176

axes, Earth's rotation, 39 azimuth, 9, 210 Aztec astronomy, 24

B ring (Saturn), 222 Babylonian astronomy, 17, 20

balloons, high-altitude, 134

barred-spiral galaxies, 319 basalt, 158 baseline, 254 Beck Telescope, 87 Bell Burnell, S. Jocelyn, 277

Bellatrix, (star), 15 belts, Jupiter, 213 Beta Cygni, 260 Beta Taurid meteor shower, 188

Betelgeuse, 252, 270 (star), 15 declination, 8 Big Bang, 361 flatness problem,

376-377 horizon problem, 375 origin, 364

timeline of events, 364 Big Dipper, 12 binary stars, 260-264 eclipsing binaries,

264-265 spectroscopic binaries,

264-265 visible binaries, 264 visual binaries, 265 binoculars, 82-84 Bishop Isidorus of Seville, 47

Bjerknes, Vilhelm, 245 black dwarfs, 272 black holes, 280-281 Cygnus X-1, 286 event horizon, 282 observing, 286 Schwarzschild radius, 282

stellar remnant, 286 supermassive, 286, 338 time dilation, 285 x-rays, 284 black-body curves, 110 blueshift, 258 Bode, Johann, 210 Bondi, Herman, 361 books, Exploring the Night

Sky with Binoculars, 83 boosters, 138 Bo├Âtes (constellation), 13

bound universe, 370 Brahe, novas, 53 Brahe, Tycho, 53 brown dwarfs, 299

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Telescopes Mastery

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