Elementary Lessons in Astronomy |
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Page 9
... half of the sky at once - is 3,000 . If we employ a small telescope this number is largely increased , as that instrument enables us to see stars too feeble to be perceived by the eye alone . For this reason such stars are called ...
... half of the sky at once - is 3,000 . If we employ a small telescope this number is largely increased , as that instrument enables us to see stars too feeble to be perceived by the eye alone . For this reason such stars are called ...
Page 11
... half years to reach us from a star of the first magnitude , twenty - eight years from a star of the second , forty - three years from a star of the third , and so on , until , for stars of the 12th magnitude , the time required is 3,500 ...
... half years to reach us from a star of the first magnitude , twenty - eight years from a star of the second , forty - three years from a star of the third , and so on , until , for stars of the 12th magnitude , the time required is 3,500 ...
Page 17
... half an hour by the most careless observer . 46. These apparent motions are caused , as we shall fully explain by and by ( Chap . IV . ) , by the two real motions of the Earth , first round its own axis , and secondly round the Sun ...
... half an hour by the most careless observer . 46. These apparent motions are caused , as we shall fully explain by and by ( Chap . IV . ) , by the two real motions of the Earth , first round its own axis , and secondly round the Sun ...
Page 18
... half that time ; and possibly both double systems may revolve round the point lying between them in something less than a million of years.1 48. Nearly 12,000 double stars are now known , and in about 600 of these orbital motion has ...
... half that time ; and possibly both double systems may revolve round the point lying between them in something less than a million of years.1 48. Nearly 12,000 double stars are now known , and in about 600 of these orbital motion has ...
Page 21
... half , and then suddenly loses its light and in three hours and a half falls to the fourth magnitude ; its brilliancy then increases again , and in another period = 12 400 。 Ceti ( called also Mira , or the Marvellous ) -it is never ...
... half , and then suddenly loses its light and in three hours and a half falls to the fourth magnitude ; its brilliancy then increases again , and in another period = 12 400 。 Ceti ( called also Mira , or the Marvellous ) -it is never ...
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Common terms and phrases
angle aphelion appear Assistant Master astronomers atmosphere attraction axis Boötes called Cambridge celestial equator celestial pole celestial sphere centre circle clock College comet constellation determined diameter direction Earth Earth's rotation Earth's surface ecliptic ELEMENTARY equal equatorial equinox exactly eye-piece fact Fcap follows globe GREEK Greenwich heavenly bodies heavens horizon Illustrated inclined Jupiter latitude length lens LESSON light longitude Mars mass measured meridian meteorites meteors miles Moon Moon's motion nearly nebulæ Neptune node object-glass observed occupied orbit parallax path penumbra perihelion planet point of Aries polar pole portion position prism Prof Professor rays refraction represent revolution revolve round right ascension ring round the Sun satellites Saturn seen shadow side sidereal solar day solstice spectrum spots stars Sun's suppose telescope tion transit travel round triangle true sun Uranus Ursa Ursa Major vapour velocity Venus vernal equinox visible
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