Popular Astronomy: A Series of Lectures Delivered at IpswichMacmillan, 1868 - 292 σελίδες |
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Σελίδα 25
... carried on to the sky , should be so directed , that in the motion of the telescope it should pass exactly through the centre of the circle which the Polar Star describes , and therefore that it should divide into two equal halves the ...
... carried on to the sky , should be so directed , that in the motion of the telescope it should pass exactly through the centre of the circle which the Polar Star describes , and therefore that it should divide into two equal halves the ...
Σελίδα 56
... carry about from one situation to another ; and next , the observations made by it are confined to that part of the heavens where the refraction is scarcely sen- sible . Refraction is a thing which , ( from the uncer- tainty attending ...
... carry about from one situation to another ; and next , the observations made by it are confined to that part of the heavens where the refraction is scarcely sen- sible . Refraction is a thing which , ( from the uncer- tainty attending ...
Σελίδα 59
... carrying the survey northward for about fifty miles . Another party was sent to Peru to make a similar measurement , but about two hundred miles in length . And no two expeditions ever rendered themselves more justly celebrated than ...
... carrying the survey northward for about fifty miles . Another party was sent to Peru to make a similar measurement , but about two hundred miles in length . And no two expeditions ever rendered themselves more justly celebrated than ...
Σελίδα 65
... carried backwards and for- wards more than twenty times from Greenwich to Valentia , to compare the clocks . The chronometers were conveyed by railway carriages , by steam boats , by mail coaches , and by Irish cars , between Green ...
... carried backwards and for- wards more than twenty times from Greenwich to Valentia , to compare the clocks . The chronometers were conveyed by railway carriages , by steam boats , by mail coaches , and by Irish cars , between Green ...
Σελίδα 81
... It is then usual to carry a third theo- dolite to the signal station : this is not absolutely necessary , but it is done as a matter of prudence , to G verify the observations in case of suspicion of error . LECTURE III . 81.
... It is then usual to carry a third theo- dolite to the signal station : this is not absolutely necessary , but it is done as a matter of prudence , to G verify the observations in case of suspicion of error . LECTURE III . 81.
Άλλες εκδόσεις - Προβολή όλων
Popular Astronomy: A Series of Lectures Delivered at Ipswich George Biddell Airy Πλήρης προβολή - 1868 |
Popular Astronomy: A Series of Lectures Delivered at Ipswich George Biddell Airy Πλήρης προβολή - 1868 |
Συχνά εμφανιζόμενοι όροι και φράσεις
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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