A Compendium of Spherical Astronomy with Its Applications to the Determination and Reduction of Positions of the Fixed StarsMacmillan, 1906 - 444 síđur |
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A Compendium of Spherical Astronomy: With Its Applications to the ... Simon Newcomb Engin sýnishorn í bođi - 2017 |
A Compendium of Spherical Astronomy: With Its Applications to the ... Simon Newcomb Engin sýnishorn í bođi - 2015 |
Common terms and phrases
aberration actual adopted altitude angle astronomical atmosphere Auwers axis Bessel Besselian catalogue celestial celestial pole celestial sphere circle coefficients column computation constant coordinates curvature declination density derived determined developed differences differential earth ecliptic ephemeris epoch equatorial expressed factor formulae fundamental stars geocentric geoid given gives Greenwich height horizon hypothesis infinitesimal initial epoch instrument integration interpolation interval kilometres latitude logarithms longitude luni-solar precession meridian meridian circle method moon's multiplied nutation observations Observatory p₁ parallax plane polar position Poulkova preceding precession probable error proper motion quantities R.A. and Dec radius rate of diminution reduction referred right ascension rigorous secular variation sidereal solar speed spherical standard standard gravity strata Substituting surface systematic corrections systematic errors t₁ temperature theory triangle values zenith distance
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Síđa 356 - B . sin c = sin b . sin C cos a = cos b . cos c + sin b . sin c cos b = cos a . cos c + sin a . sin c cos A cos B cos c = cos a . cos b + sin a . sin b . cos C ..2), cotg b . sin c = cos G.
Síđa v - The present volume is the first of a projected series having the double purpose of developing the elements of Practical and Theoretical Astronomy for the special student of the subject, and of serving as a handbook of convenient reference for the use of the working astronomer In applying methods and formulae.
Síđa 223 - There is, perhaps, no branch of practical astronomy on which so much has been written as on this (astronomical refraction) and which is still in so unsatisfactory a state. The difficulties connected with it are both theoretical and practical. The theoretical difficulties arise from the uncertainty and variability of the law of diminution of the density of the atmosphere with height, and also from...
Síđa 165 - ... the ratio of the velocity of the Earth in its orbit to the velocity of light, might not need correction or modification.
Síđa 385 - Catalogue of 12,441 stars for the epoch 1880, from observations made at the Royal Observatory, Cape of Good Hope, during the years 1871 to 1879.
Síđa 250 - The circumstances in these cases are different from those of the earth and moon, in the important respect that the ratio of the mass of the moon to that of the earth is much greater than the ratio of the mass of any other satellite to that of its primary.
Síđa 385 - First Melbourne General -Catalogue of 1227 stars for the epoch 1870 deduced from observations extending from 1863 to 1870 made at the Melbourne Observatory.
Síđa v - The most urgent want which the work is intended to supply is that of improved methods of deriving and reducing the positions and proper motions of the fixed stars. Modifications of the older methods are made necessary by the long period through which positions of the stars have to be reduced, and by the extension of astronomical and statistical researches to a great and constantly increasing number of telescopic stars. Especial attention has therefore been given to devising the most expeditious and...
Síđa 116 - Before the introduction of railways, people used to set their clocks by the sun. But owing to the obliquity of the ecliptic and the eccentricity of the earth's orbit around the sun, the intervals between successive passages of the sun are not exactly equal. The consequence is that, if a clock keeps exact time, the sun will sometimes pass the meridian before and sometimes after twelve by the clock. When this was understood, a distinction was made between apparent...
Síđa 226 - They concluded from this that this phenomenon is due to the action of the sun and moon upon the sea.