Elementary Lessons in Astronomy |
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Page 1
... a cres- cent and now as a full moon , sometimes rendering the stars invisible in the same way as the sun does , B though in a less degree , and showing us by INTRODUCTION LESSON PAGE General Notions -The Uses of Astronomy CHAPTER.
... a cres- cent and now as a full moon , sometimes rendering the stars invisible in the same way as the sun does , B though in a less degree , and showing us by INTRODUCTION LESSON PAGE General Notions -The Uses of Astronomy CHAPTER.
Page 2
Sir Norman Lockyer. though in a less degree , and showing us by its changes that there is some difference between it and the sun ; for while the sun always appears round , because we receive light from all parts of its surface turned ...
Sir Norman Lockyer. though in a less degree , and showing us by its changes that there is some difference between it and the sun ; for while the sun always appears round , because we receive light from all parts of its surface turned ...
Page 19
... less than a million of years . * 48. More than 6,000 double stars are now known , Fig . 2 .-- The Double - double Star in the constellation Lyra . 1. As seen in an opera - glass . 2. As seen in a small telescope . 3. As seen in a ...
... less than a million of years . * 48. More than 6,000 double stars are now known , Fig . 2 .-- The Double - double Star in the constellation Lyra . 1. As seen in an opera - glass . 2. As seen in a small telescope . 3. As seen in a ...
Page 21
... less than three days . ness- 55. Among the new , or temporary stars , those ob- served in 1572 and last year ( 1866 ) are the most notice- able . The first appeared suddenly in the sky and was visible for seventeen months ; its light at ...
... less than three days . ness- 55. Among the new , or temporary stars , those ob- served in 1572 and last year ( 1866 ) are the most notice- able . The first appeared suddenly in the sky and was visible for seventeen months ; its light at ...
Page 22
... less rapid . There is good reason to believe that this increased brilliancy was due to the sudden ignition of hydrogen gas in the star's atmo- sphere . Here we have a fact which must prove of the highest importance , although we are not ...
... less rapid . There is good reason to believe that this increased brilliancy was due to the sudden ignition of hydrogen gas in the star's atmo- sphere . Here we have a fact which must prove of the highest importance , although we are not ...
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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
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