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 487by Great Britain. Nautical Almanac Office - 1852Full view - About this book
| john murray, albemarle-street - 1833
...the view of obtaining a convenient and uniform measure of time, have recourse to a mean War <Ini/, **the length of which is equal to the mean or average...all the apparent solar days in a year. An imaginary** Sim, called the mean Sun, is conceived to move uniformly in the Equator with the real Sun's mean motion... | |
| John Hymers - Astronomy - 1840 - 354 pages
...called a mean solar day, which is the computed average length of the actual solar days; ie its length **is equal to the mean or average of all the apparent solar days in a year;** as its commencement never differs much from that of the real solar day, and as its length is invariable,... | |
| Janet Taylor - 1842
...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 revolved... | |
| Nautical almanacs - 1846
...day, as determined by any of these bodies, is therefore a variable quantity. Astronomers, with the **view of obtaining a convenient and uniform measure...is equal to the mean or average of all the apparent** sqlar days in a year. An imaginary Sun, called the mean Sun, is conceived to move uniformly in the... | |
| Mrs. Janet Taylor - Transportation - 1851
...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 revolved... | |
| John William Norie - 1852
...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...average, of all the apparent solar days in a year;** such as would be shewn by the sun if it moved always uniformly in the equinoctial: a clock, or chronometer,... | |
| Janet Taylor - 1852
...commenced anew. In order, therefore, to obtain a convenient and equable measure of time, astronomers assume **a mean solar day, the length of which is equal to the** average of all the apparent solar days in a year. The interval by which the apparent is in excess or... | |
| Elias Loomis - Spherical astronomy - 1855 - 497 pages
...solar days are unequal ; and to avoid the inconvenience which would result from this fact, astronomers **have recourse to a mean solar day, the length of which...average of all the apparent solar days in a year.** (157.) The length of the mean solar day is different from that of the sidereal, because when the mean... | |
| Janet Taylor - 1865
...commenced anew. In order therefore, to obtain a convenient and equable measure of time, Astronomers assume **a mean solar day, the length of which is equal to the** average length of all the apparent solar days in the year. The interval by which the apparent is in... | |
| Elias Loomis - Astronomy - 1866 - 338 pages
...solar days are unequal ; and to avoid the inconvenience which would result from this fact, astronomers **have recourse to a mean solar day, the length of which...average of all the apparent solar days in a year.** 118. Sidereal and solar time compared. — The length of the mean solar day is greater than that of... | |
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