The Geography of the Heavens, and Class Book of Astronomy: Accompanied by a Celestial Atlas |
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Page 29
... sidereal revolutions , shows the difference between solar and sidereal time . The first column contains the numbers of complete revolu- tions of the stars , or of the Earth's rotation on its axis ; the second exhibits the Into how many ...
... sidereal revolutions , shows the difference between solar and sidereal time . The first column contains the numbers of complete revolu- tions of the stars , or of the Earth's rotation on its axis ; the second exhibits the Into how many ...
Page 22
... sidereal revolution of Mercury , is 87d . 23h . 15m . 44s . Its synodical revolution is found by dividing the whole circumference of 360 ° by its rela- tive motion in respect to the Earth . Thus , the mean daily motion of Mercu- ry is ...
... sidereal revolution of Mercury , is 87d . 23h . 15m . 44s . Its synodical revolution is found by dividing the whole circumference of 360 ° by its rela- tive motion in respect to the Earth . Thus , the mean daily motion of Mercu- ry is ...
Page 41
... revolution in the same instant . It is evident , that in proportion to the ... rotation , and all complete their revolutions at the same instant . In short , there is no more reason to suppose ... sidereal day , because , in THE EARTH . 41.
... revolution in the same instant . It is evident , that in proportion to the ... rotation , and all complete their revolutions at the same instant . In short , there is no more reason to suppose ... sidereal day , because , in THE EARTH . 41.
Page 42
... revolution around the Earth . But , as the Earth advances almost a degree eastward in its orbit , in the time that ... sidereal days in a year . And , generally , since the rotation of any planet about its axis is the length of a sidereal ...
... revolution around the Earth . But , as the Earth advances almost a degree eastward in its orbit , in the time that ... sidereal days in a year . And , generally , since the rotation of any planet about its axis is the length of a sidereal ...
Page 44
... revolution , the sidereal days are always of the same length , but the solar or natural days vary very considerably at different times of the year . This variation is owing to two distinct causes : the inclination of the Earth's axis to ...
... revolution , the sidereal days are always of the same length , but the solar or natural days vary very considerably at different times of the year . This variation is owing to two distinct causes : the inclination of the Earth's axis to ...
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Common terms and phrases
3d magnitude 4th magnitude ancient angle appear Arcturus Argo Navis Aries astronomers Auriga axis Beta brightest called Cassiopeia celestial centre Cepheus circle cluster colure comet constellation Cor Caroli declination degree Denebola diameter direction distinguished diurnal motion Earth east ecliptic equal equator equinoctial figure fixed stars Gamma globe head heavenly bodies heavens Hercules Herschel horizon Hydra Jupiter latitude length Libra light longitude maps mean distance Mercury meridian millions of miles minutes Moon Moon's motion naked eye nearest nearly nebulæ night node north pole northern observed orbit Orion parallax passing perihelion period Perseus phenomena planets Pleiades polar star principal star represented revolve right ascension rise satellites Saturn seasons seen side sidereal revolution Sirius situated small stars solar system solstice southern hemisphere spots Sun's supposed surface Taurus telescope tion triangle Ursa Ursa Major Venus vernal equinox Virgo visible whole number Zeta Zodiac