Elementary Lessons in Astronomy |
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Page 10
... shown in the following table : - A star of the 5th magnitude • Times . " " 4th 3d 99 2d 99 " 9 2 • 6 12 • · 25 Ist Sirius , the brightest of the Ist magnitude stars The Sun , the nearest star to us 100 324 6,480,000,000,000 24. Now it ...
... shown in the following table : - A star of the 5th magnitude • Times . " " 4th 3d 99 2d 99 " 9 2 • 6 12 • · 25 Ist Sirius , the brightest of the Ist magnitude stars The Sun , the nearest star to us 100 324 6,480,000,000,000 24. Now it ...
Page 16
... shown to the right of the other on a star - map , but to the left of it on a globe . 42. The twenty brightest stars in the heavens , or first magnitude stars , are as follow : they are given in the order of brightness , and should be ...
... shown to the right of the other on a star - map , but to the left of it on a globe . 42. The twenty brightest stars in the heavens , or first magnitude stars , are as follow : they are given in the order of brightness , and should be ...
Page 41
... shown ( Art . 104 ) , this rotation has been deduced from the time taken by the spots to cross the disc ; but it now seems that all sun - spots have a movement of their own , and that the rapidity of this movement varies regularly with ...
... shown ( Art . 104 ) , this rotation has been deduced from the time taken by the spots to cross the disc ; but it now seems that all sun - spots have a movement of their own , and that the rapidity of this movement varies regularly with ...
Page 45
... shown in the spot is called the penumbra ( that is , half shade ) ; inside the penumbra is a still darker shade , called the umbra , and inside this again is the nucleus . Diagrams 3 and 4 of Plate IV . will render this perfectly clear ...
... shown in the spot is called the penumbra ( that is , half shade ) ; inside the penumbra is a still darker shade , called the umbra , and inside this again is the nucleus . Diagrams 3 and 4 of Plate IV . will render this perfectly clear ...
Page 46
... shown in Plate IV . 113. Near the edge of the solar disc , and especially about spots approaching the edge , it is quite easy , even with a small telescope , to discern certain very bright streaks of diversified form , quite distinct in ...
... shown in Plate IV . 113. Near the edge of the solar disc , and especially about spots approaching the edge , it is quite easy , even with a small telescope , to discern certain very bright streaks of diversified form , quite distinct in ...
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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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