Elementary Lessons in Astronomy |
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Page 25
... turn the water into steam and the molten iron into iron- vapour ; but again the heat required to vaporize the iron is vastly greater than that required to turn the water into steam - how much greater may be gathered from the fact that ...
... turn the water into steam and the molten iron into iron- vapour ; but again the heat required to vaporize the iron is vastly greater than that required to turn the water into steam - how much greater may be gathered from the fact that ...
Page 34
... turns into a spiral coil of nebulous matter , and the outlying mass is seen connected with the main mass by a curved band . 33 M. Piscium , and 99 M. Virginis , are other examples of this strange phenomenon , which indicate to us the ...
... turns into a spiral coil of nebulous matter , and the outlying mass is seen connected with the main mass by a curved band . 33 M. Piscium , and 99 M. Virginis , are other examples of this strange phenomenon , which indicate to us the ...
Page 39
... turns round , or rotates , on an axis ; this rotation was discovered by observing the spots on its surface , about which we shall have much to say in the next Lesson . It is found that the spots always make their first appear- THE SUN . 39.
... turns round , or rotates , on an axis ; this rotation was discovered by observing the spots on its surface , about which we shall have much to say in the next Lesson . It is found that the spots always make their first appear- THE SUN . 39.
Page 41
... turns round . case . The Sun's axis inclines towards the point occu- pied by the Earth in September . When we come to deal with the Earth and the other planets , we shall find that their axes also incline in different directions . 107 ...
... turns round . case . The Sun's axis inclines towards the point occu- pied by the Earth in September . When we come to deal with the Earth and the other planets , we shall find that their axes also incline in different directions . 107 ...
Page 52
... turns the gas which , were it to accumulate , would kill all men and animals , into the life of plants . Thus , then , does the Sun build up the vegetable world . 129. Now , let us think a little . The enormous engines which do the ...
... turns the gas which , were it to accumulate , would kill all men and animals , into the life of plants . Thus , then , does the Sun build up the vegetable world . 129. Now , let us think a little . The enormous engines which do the ...
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Common terms and phrases
angular aphelion apparent motion appear astronomers atmosphere attraction base line Boötes called Cassiopea celestial equator celestial pole celestial sphere centre Cepheus clock colour comet constellations density determined diameter direction Earth Earth's axis Earth's rotation Earth's surface ecliptic equal equatorial exactly eye-piece fact fall feet globe Greenwich heat heavenly body heavens Hence horizon inclined instance Jupiter latitude length lens LESSON light longitude Mars mass mean sun measured meridian meteors midnight miles Moon Moon's nearly nebulæ Neptune night node noon object-glass observed occupied parallax pass path perihelion period planet point of Aries polar portion position prism rays refraction represent revolution revolve round right ascension ring rise round the Sun satellites Saturn seen shadow side sidereal solar day solstice spectrum stars Sun's suppose telescope tion triangle true sun Uranus Ursa Major vapour varies velocity Venus vernal equinox visible zenith distance
Popular passages
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