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 527by Great Britain. Nautical Almanac Office - 1852Full view - About this book
| 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... | |
| 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... | |
| 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... | |
| 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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