Mechanism of the HeavensJ. Murray, 1831 - 621 pages |
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Page xii
... very small inclination to the plane of the ecliptic in which the earth moves ; and on that account , astronomers refer their motions to it at a given epoch as a known and fixed position . The paths xii PRELIMINARY DISSERTATION .
... very small inclination to the plane of the ecliptic in which the earth moves ; and on that account , astronomers refer their motions to it at a given epoch as a known and fixed position . The paths xii PRELIMINARY DISSERTATION .
Page xiii
Mary Somerville. epoch as a known and fixed position . The paths of the pla- nets , when their mutual disturbances are omitted , are ellipses nearly approaching to circles , whose planes , slightly inclined to the ecliptic , cut it in ...
Mary Somerville. epoch as a known and fixed position . The paths of the pla- nets , when their mutual disturbances are omitted , are ellipses nearly approaching to circles , whose planes , slightly inclined to the ecliptic , cut it in ...
Page xv
... epoch for the convenience of astronomical computa- tion , is subject to a minute secular variation of 52 " , 109 , occa- sioned by the reciprocal action of the planets ; but as this is also periodical , the terrestrial equator , which ...
... epoch for the convenience of astronomical computa- tion , is subject to a minute secular variation of 52 " , 109 , occa- sioned by the reciprocal action of the planets ; but as this is also periodical , the terrestrial equator , which ...
Page xxxix
... epoch , the heat of the summers must have been very great , though possibly compensated by the rigour of the win- ters ; at all events , none of these changes affect the length of the day . It appears from the marine shells found on the ...
... epoch , the heat of the summers must have been very great , though possibly compensated by the rigour of the win- ters ; at all events , none of these changes affect the length of the day . It appears from the marine shells found on the ...
Page xlvi
... epoch , and that the vernal equinox of that year should be the first day of the first year . The variations in the positions of the solar ellipse occasion corresponding changes in the length of the seasons . In its pre- sent position ...
... epoch , and that the vernal equinox of that year should be the first day of the first year . The variations in the positions of the solar ellipse occasion corresponding changes in the length of the seasons . In its pre- sent position ...
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Common terms and phrases
A₁ action angle ascending node attraction axes axis B₁ becomes c'mv centre of gravity centrifugal force co-ordinates coefficients comets computed conic sections consequently cosines curve density depending determined differential direction disturbing forces dR dR dt dt earth eccentricity ecliptic elements epoch equal equilibrium equinoxes expression fixed plane fluid functions give hence inclination indefinitely small integral Jupiter latitude mass mean anomaly mean distance mean longitude mean motion moon moon's move nearly observation omitted orbit of Jupiter oscillations parallax particle perigee perihelion periodic inequalities perturbations planets preceding equation preceding values radius vector ratio regard rotation satellites Saturn secular inequalities secular variations sidereal sine spheroid square substituted surface system of bodies terrestrial theory tion true longitude Uranus velocity whence zero