 ... ascensions are reckoned. This point may be considered as a star, though no star is, in fact, there; and, moreover, the point itself is liable to a certain slow variation, — so slow, however, as not to affect, perceptibly, the interval of any two...  Spherical Astronomy ... - Pàgina 76per Franz Brünnow - 1865 - 560 pàginesVisualització completa - Sobre aquest llibre
 | sir John Frederick W. Herschel (1st bart.) - 1833 - 500 pàgines
...affect, perceptibly, the interval of any two of its successive returns to the meridian. This interval is called a sidereal day, and is divided into 24 sidereal hours, and these again into minutes and seconds. A clock which marks sidereal time, ie which goes uniformly... | |
 | Sir John Frederick William Herschel - 1833 - 444 pàgines
...affect, perceptibly, the interval of any two of its successive returns to the meridian. This interval is called a sidereal day, and is divided into 24 sidereal hours, and these again into minutes and seconds. A clock which marks sidereal time, ie which goes uniformly... | |
 | John Frederick William Herschel - 1849 - 672 pàgines
...affect, perceptibly, the interval of any two of its successive returns to the meridian. This interval is called a sidereal day, and is divided into 24 sidereal hours, and these again into minutes and seconds. A clock which marks sidereal time, ie which goes at such... | |
 | Franz Brünnow - 1865 - 584 pàgines
...rightascension by a , we have : x" = cos d cos a, yn = cos $ sin a, zn = sin 8. The co-ordinates a and d are constant for any star. In order to find from them...of the vernal equinox crosses the meridian, it is P when its hour-angle is 15° or lh etc. For this reason the equator is divided not only in 360° but... | |
 | Elias Loomis - 1866 - 384 pàgines
...0s., they will point to 0h. 0m. 0s. when the same star is next seen on the meridian. This interval is called a sidereal day, and is divided into 24 sidereal hours. If the clock were perfect, the pendulum would make 86,400 vibrations in the interval between two successive... | |
 | Elias Loomis - 1870 - 274 pàgines
...0s., they will point to 0h. 0m. 0s. when the same star is next seen on the meridian. This interval is called a sidereal day, and is divided into 24 sidereal hours. If the pendulum were perfectly adjusted, it would make 86,400 vibrations in the interval between two... | |
 | Elias Loomis - 1893 - 374 pàgines
...0s., they will point to 0h. 0m. 0s. when the same star is next seen on the meridian. This interval is called a sidereal day, and is divided into 24 sidereal hours. If the clock were perfect, the pendulum would make 86,400 vibrations in the interval between two successive... | |
 | 1902 - 650 pàgines
...rise in the east and to set in the west, making a complete revolution in the same period; this period is called a sidereal day and is divided into 24 sidereal hours, each hour being subdivided into minutes and seconds. Since this apparent motion is due to the rotation... | |
 | International Correspondence Schools - 1908 - 626 pàgines
...in the east and to set in the west, making a con> plete revolution in the same period. This period is called a sidereal day and is divided into 24 sidereal hours, each hour being subdivided into minutes and seconds. Since this apparent motion is due to the rotation... | |
 | 1909 - 532 pàgines
...rise in the east and to set in the west, making a complete revolution in the same period. This period is called a sidereal day and is divided into 24 sidereal hours, each hour being subdivided into minutes and seconds. Since this apparent motion is due to the rotation... | |
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