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Books Books 21 - 24 of 24 on Hence it is that astronomers, with a view of obtaining a convenient and uniform measure....  
" Hence it is that astronomers, with a view of obtaining a convenient and uniform measure of time, have recourse to a mean solar day, the length of which is equal to the mean or average of all the apparent solar days in the year. An imaginary Sun, called... "
The Nautical Almanac and Astronomical Ephemeris - Page 527
by Great Britain. Nautical Almanac Office - 1852
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Elements of Astronomy Designed for Academics and High Schools

Elias Loomis - History - 1897 - 254 pages
...inconvenience which would result from this fact, astronomers employ a mean solar day, whose length is equal to the mean or average of all the apparent solar days in a year. 115. Sidereal and Solar Time compared. The length of the mean solar day is greater than that of...
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A treatise on navigation and nautical astronomy

William Robert Martin - Transportation - 1899 - 429 pages
...order to obtain a uniform measure of solar time, an imaginary day is employed, which is equal in length to the mean or average of all the apparent solar days in a year. Such a day is termed a mean solar day, and is regulated by an imaginary or mean sun, commencing when...
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A Manual of the Principle Instruments Used in American Engineering and ...

W. & L.E. Gurley - Surveying - 1908 - 470 pages
...order to have a uniform measure of time, we have MEAN recourse to what is termed a mean solar day, SOLAR DAY the length of which is equal to the mean or average of all the solar days in a year. The time thus given is called mean solar time, and is MEAN tne same at any instant...
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Gurley Manual of Surveying Instruments

Gurley, W. & L. E., Troy, N.Y. - Surveying - 1908
...a uniform measure of time, we have Mean recourse to what is termed a mean solar day. So1ar Day t]le length of which is equal to the mean or average of all the solar days in a year. The time thus given is called mean solar time, and is Mean the same at any instant...
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