By Patrick Moore
The hot Philip's Astronomy Encyclopedia is among the such a lot accomplished, authoritative and obtainable books on astronomy. in additional than 3000 alphabetically geared up articles and over 500 pictures and diagrams, it covers every thing and everybody from the Anglo-Australian Observatory to Fritz Zwicky. Its 464 pages contain a number of significant articles on topics corresponding to our Galaxy, the solar and planets, optical and radio telescopes, stars, black holes, astrophysics, observatories, astronomical images, area programmes, the constellations and recognized astronomers. aiding those articles are shorter entries on planetary positive aspects and satellites, asteroids, observational recommendations, comets, satellite tv for pc launchers, meteros, and topics as various as lifestyles within the Universe and the constitution of meteorites. ratings of tables record the brightest stars within the significant constellations, annual meteor showers, significant variable stars, dwarf stars, power creation procedures within the sunlight, and different correct info. Philip's Astronomy Encyclopedia is written by means of greater than a hundred prime astronomers from the world's universities and observatories, each one a professional in a really expert box of data. they've got produced an up to date and trustworthy renowned reference paintings for 2001 and past.
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Additional resources for Philip's Astronomy Encyclopedia: A comprehensive and authoritative A-Z guide to the Universe (Revised Edition)
Alpheratz The celebrity ␣ Andromedae, visible magazine. 2. 07, distance ninety seven l. y. It has a weird SPECTRUM, labeled as B9p, which has popular traces of mercury and magnesium. Its identify is derived from the Arabic alfaras, that means ‘the horse’, because it was once considered as being shared with neighbouring Pegasus (and was once additionally distinctive ␦ Pegasi); certainly, it nonetheless marks one nook of the sq. OF PEGASUS. Its replacement identify, Sirrah, is derived from the Arabic surrat al-faras, which means ‘horse’s navel’. Alphonso X (1221–84) King of Léon and Castile (part of contemporary Spain), referred to as Alphonso the clever, a client of studying and particularly of astronomy. He commissioned a brand new version of the hugely profitable Toledan Tables of the motions of the solar, Moon and 5 naked-eye planets, ready initially by means of AL-ZARQA¯ LI¯ in Toledo a century earlier than. the recent Alphonsine Tables, incorporating ten years of revised observations and accomplished in 1272, weren't outmoded for nearly four hundred years. Alphonsus Lunar crater (13º. 5S 3ºW), 117 km (72 mi) throughout. Its fault-dissected partitions upward thrust to over 3000 m (10,000 feet) above the ground. operating approximately north–south around the ground is a ridge method, that's 15 km (9 mi) large and, on the element the place it varieties a favourite crucial height, approximately a thousand m (3000 feet) excessive. inside of Alphonsus are a sequence of kilometre-sized elliptical good points with haloes of darkish fabric; they're orientated approximately parallel to the crucial ridge process and are thought of via many planetary geologists to be of volcanic starting place. In 1958 Soviet astrophysicist Nikolai Kozyrev (1908–83) acquired a spectrum displaying blue emission strains, which he interpreted as evidence of a gaseous emission from the crater’s significant top, yet those effects have by no means been duplicated. The north wall of Alphonsus overlaps the south wall of PTOLEMAEUS, indicating that Alphonsus shaped following the Ptolemaeus impression occasion. ALPO Abbreviation of organization OF LUNAR AND PLANETARY OBSERVERS Alrescha The famous person ␣ Piscium, visible magazine. three. eighty two, distance 139 l. y. it's a shut binary with a calculated orbital interval of round 930 years. The brighter part, of magazine. four. 2, is a unusual a celeb of spectral kind A0p with powerful strains of silicon and strontium; the fainter spouse, magazine. five. 2, is a metallic-line a celeb, variety A3m. The identify Alrescha, occasionally additionally spelled Alrisha, comes from an Arabic note which means ‘the cord’. horizontal axis vertical axis al-Su¯f ¯ı, Abu’l-Husain (Latinized as Azophi) (903–986) Arab astronomer (born in smooth Iran) recognized for his Kita¯b suwar al-kawa¯kib al-tha¯bita (‘Book at the Constellations of the fastened Stars’), a close revision, established upon his personal observations, of PTOLEMY’s superstar catalogue. during this paintings he pointed out the celebs of every constellation through their Arab names, supplying a desk of revised magnitudes and positions in addition to drawings of every constellation. Al-Su¯ fı¯ used to be the 1st to explain the 2 brightest galaxies seen to the bare eye: the Andromeda Galaxy and the big Magellanic Cloud, which he known as the White Bull.