Popular Astronomy: A Series of Lectures Delivered at IpswichMacmillan, 1868 - 292 sider |
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Side 8
... axis . It is necessary to show that this is supported by accurate means of observation . Now there is one instrument in use in the best Astro- nomical Observatories ... axis AB , and the axis is placed in that direction 8 POPULAR ASTRONOMY .
... axis . It is necessary to show that this is supported by accurate means of observation . Now there is one instrument in use in the best Astro- nomical Observatories ... axis AB , and the axis is placed in that direction 8 POPULAR ASTRONOMY .
Side 9
A Series of Lectures Delivered at Ipswich George Biddell Airy. AB , and the axis is placed in that direction which FIG . 1 . leads to the point of the sky around which the stars The appear to turn , and which is not far. LECTURE I. 9.
A Series of Lectures Delivered at Ipswich George Biddell Airy. AB , and the axis is placed in that direction which FIG . 1 . leads to the point of the sky around which the stars The appear to turn , and which is not far. LECTURE I. 9.
Side 10
... axis being adjusted with great accuracy in that direction , the instrument turns round that axis , and it carries the telescope CD , which , of course , so long as you give it no other motion , retains the same inclination to that axis ...
... axis being adjusted with great accuracy in that direction , the instrument turns round that axis , and it carries the telescope CD , which , of course , so long as you give it no other motion , retains the same inclination to that axis ...
Side 11
... axis , in which works an endless screw or worm , as at E , Figure 1. By turning it , the whole instru- ment is made to revolve . This worm , or screw , is turned by an apparatus which is constructed expressly for uniform movement ...
... axis , in which works an endless screw or worm , as at E , Figure 1. By turning it , the whole instru- ment is made to revolve . This worm , or screw , is turned by an apparatus which is constructed expressly for uniform movement ...
Side 12
... axis uniformly , and it thus gives us the means of ascertaining , with the utmost exactness , whether it be true , or whether it be not true , that all the stars do move with equal angular speed around one imaginary axis . When this ...
... axis uniformly , and it thus gives us the means of ascertaining , with the utmost exactness , whether it be true , or whether it be not true , that all the stars do move with equal angular speed around one imaginary axis . When this ...
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Popular Astronomy: A Series of Lectures Delivered at Ipswich George Biddell Airy Uten tilgangsbegrensning - 1868 |
Popular Astronomy: A Series of Lectures Delivered at Ipswich George Biddell Airy Uten tilgangsbegrensning - 1868 |
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aberration of light accurate angle angular distance appear ascertain astronomers ball body bright star calculation Cambridge Cape Cavendish experiment celestial clock cloth College computed Crown 8vo curve described diameter direction disturbed earth earth's axis earth's centre earth's equator ecliptic Edition effect ellipse endeavoured equatoreal exactly explain Fcap Figure fluid globe Greenwich heavens horizon hour inclination Jupiter lecture length lunar precession Mars mean density method millions of miles moon mountain move Mural Circle nearly North Pole nutation object observations Observatory orbit parallax passes the meridian path pendulum perpendicular planets plumb-line point of Aries Polar Star position precession produced proportion pull refraction remark revolve rotation round the sun satellites seen sidereal day solar South Pole spheroid square sun's attraction sun's distance suppose supposition surface tance telescope thing tion transit instrument transit of Venus TREATISE triangle velocity vertical vibrations whole yard measure Zenith Sector
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