 | Ephemerides - 1841 - 630 pages
...Astronomers, with the 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 a year. An imaginary Sun, called the mean Sun, is... | |
 | Janet Taylor - Nautical astronomy - 1842 - 592 pages
...ineonvenicnee arising from this want of uniformity in the length of the natural days, recourse is had to a mean solar day, the length of which is equal to the mean of all the apparent solar days in a year, and is such as would be shewn by the sun, if the earth... | |
 | Ephemerides - 1842 - 624 pages
...Astronomers, with the 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 a year. An imaginary Sun, called the mean Sun, is... | |
 | Ephemerides - 1843 - 634 pages
...Astronomers, with the 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 a year. An imaginary Sun, called the mean Sun, is... | |
 | Ephemerides - 1846 - 646 pages
...Astronomers, with the 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 a year. An imaginary Sun, called the mean Sun, is... | |
 | Ephemerides - 1850 - 668 pages
...quantity. 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 a year. An imaginary Sun, called the mean Sun, is... | |
 | Janet Taylor - Nautical astronomy - 1851 - 674 pages
...considerably at different times of the year, and in order to obviate this inconvenience, recourse is had to a mean solar day, the length of which is equal to the mean of all the apparent solar days in a year, and is such as would be shown by the sun if the earth... | |
 | Great Britain. Nautical Almanac Office - 1852 - 676 pages
...quantity. 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 a year. An imaginary Sun, called the mean Sun, is... | |
 | John William Norie - Nautical astronomy - 1852 - 844 pages
...with the view of obtaining a convenient and uniform measure of time, have recourse to what they call a mean solar day, the length of which is equal to the mean, or average, of all the apparent solar days in a year; such as would be shewn by the sun if it... | |
 | Elias Loomis - Spherical astronomy - 1855 - 508 pages
...unequal ; and to avoid the inconvenience which would result from this fact, astronomers 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 a year. (157.) The length of the mean solar day is... | |
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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 a year. An imaginary Sun, called the mean Sun... 
