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" The astronomical, or civil, day is constantly changing. This variation arises from two causes; 1. The unequal motion of the earth in its orbit ; 2. The obliquity of that orbit to the plane of the equator. [The mean and apparent solar days are never equal,... "
Astronomical Tables and Formulæ Together with a Variety of Problems ... - Page 20
by Francis Baily - 1827 - 304 pages
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A treatise on astronomy

Olinthus Gilbert Gregory - 1802 - 590 pages
...days and apparent Time. 73 by 24 hours, will give 23*" 56™ 4* for the length Sofa sidereal day. 115. The mean and apparent solar days are never equal, except when the sun's daily motion in rightascension is 59' 8"; this is nearly the case about April ifth, June i5th, September ist, and December...
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The Gallery of Nature and Art; Or, A Tour Through Creation and Science, Volume 1

Edward T W. Polehampton - 1815 - 568 pages
...will be 23h 56' 4",iy The astronomical, or civil, day is constantly changing. This variation arises from two causes; 1. The unequal motion of the earth...when the sun's daily motion in right ascension is 5g' 8". This is the case about April Hit It, June l6th, September 1st, and December 25th ; on these...
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The Panorama of Science and Art: Embracing the Sciences of ..., Volume 1

James Smith - 1815 - 684 pages
...The length both of the astronomical and the civil day is constantly chiinging. This variation arises from two causes: 1. The unequal motion of the earth in its orbit. 2. The nMiquity of that orbit to the plane of the- equator. The mean and apparent solar days are never equal,...
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Universal Science Or the Cabinet of Nature and Art, Comprising ..., Volume 1

Alexander Jamieson - 1821 - 448 pages
...cannot exceed 2° 42'. The astronomical, or civil, day is constantly changing. This variation arises from two causes; 1. The unequal motion of the earth...obliquity of that orbit to the plane of the equator. The annual intersection of the equator with the ecliptic is not always in the same point: but is retrograde,...
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Encyclopaedia Britannica; Or A Dictionary of Arts, Sciences, and ..., Volume 3

1823 - 894 pages
...at the same moment. True time is obtained by adding or subtracting this equation to the mean time. The mean and apparent solar days are never equal,...when the sun's daily motion in right ascension is 59' 8" ; this is nearly the case about April I5th, June 151)1, September ist, and December 24th : on...
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Dictionary of the Mathematical and Physical Sciences, According to the ...

James Mitchell - 1823 - 666 pages
...day will be 23* 5G'4»-l. The astronomical or civil day is constantly changing. This variation arises from two causes : 1. The unequal motion of the earth in its 01 bit ; 2. The obliquity of that orbit to the plane of the equator. The mean and apparent solar days...
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Iron: An Illustrated Weekly Journal for Iron and Steel ..., Volume 9

Perry Fairfax Nursey - 1828 - 410 pages
...perturbations produced by the latter causes will make but little or no variation in the Examples already given. The mean and apparent solar days are never equal,...when the sun's daily motion in right ascension is 59 minutes 8 seconds; -which obtains about the 15th of April, 15th of June, 1st of September, and 24th...
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The Complete Mathematical and General Navigation Tables: Including Every ...

Thomas Kerigan - 1838 - 804 pages
...length. But, owing to the inequalities of the earth's annual motion in an elliptic orbit, combined with the obliquity of that orbit to the plane of the equator, the length of the solar day is constantly varying. And because the ecliptic is inclined to the equator...
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The popular encyclopedia; or, 'Conversations Lexicon': [ed. by A. Whitelaw ...

Popular encyclopedia - 1846 - 886 pages
...woulc change a degree every day, ami then the siderea days would be 4 minutes shorter than the solar. The mean and apparent solar days are never equal,...when the sun's daily motion in right ascension is 59' ; which is nearly the case about the 15th of April, the 15th of June, the 1st of September, and...
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On the Connection of the Physical Sciences

Mary Somerville - 1846 - 506 pages
...amounting to as much as sixteen minutes. The apparent and mean time coincide four times in the year ; when the sun's daily motion in right ascension is equal to 59' 8"-33 in a mean solar day, which happens about the 1 6th of April, the 16th of June, the 1st of September,...
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