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" 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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the nautical almanac and astronomical phemeris for the year 1835

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...
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The Elements of the Theory of Astronomy

John Hymers - 1840
...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,...
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An epitome of navigation, and nautical astronomy, with the improved lunar tables

Janet Taylor - Transportation - 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...
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The Nautical Almanac and Astronomical Ephemeris for the Year ...

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...
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An epitome of navigation and nautical astronomy, with improved lunar tables ...

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...
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A new and complete epitome of practical navigation

John William Norie - Transportation - 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,...
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Hand-book to the Local marine board examination [by J. Taylor].

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...
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An introduction to practical astronomy: with a collection of astronomical tables

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...
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Hand-book to the Local marine board examination

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...
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A Treatise on Astronomy

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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