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The precession of the equinoxes is due to the fact that the earth performs a motion of this kind about its centre, and the whole class of such motions has therefore been termed precessional.

00The earths precessional motion is of this latter type, the angles being ci = .0087, ~=23 28.

00The polhode and herpoihode cones are then right circular, and the motion is precessional according to the definition of 18.

00We can hence deduce the condition of steady precessional motion in a top. A solid of revolution is supposed to be free to turn about a fixed point 0 on its axis of symmetry, its masscentre G being in this axis at a distance h from 0.

00If we put Oso we get the condition of steady precessional motion in a form equivalent to (3).

00The theory of disturbed precessional motion there outlined does not give a convenient view of the oscillations of the axis about the vertical position.

00This fundamental advance rendered inevitable the detection of precessional effects.

00They have an apparent precessional movement, the exact amount of which can be arrived at only by prolonged and toilsome enquiries.

00The astrological zodiac has its roots in the science of astronomy - a legacy from the twelve divisions of the precessional cycle.

00The precession of the equinoxes is due to the fact that the earth performs a motion of this kind about its centre, and the whole class of such motions has therefore been termed precessional.

00The earths precessional motion is of this latter type, the angles being ci = .0087, ~=23 28.

00The polhode and herpoihode cones are then right circular, and the motion is precessional according to the definition of 18.

00We can hence deduce the condition of steady precessional motion in a top. A solid of revolution is supposed to be free to turn about a fixed point 0 on its axis of symmetry, its masscentre G being in this axis at a distance h from 0.

00If we put Oso we get the condition of steady precessional motion in a form equivalent to (3).

00The theory of disturbed precessional motion there outlined does not give a convenient view of the oscillations of the axis about the vertical position.

00This fundamental advance rendered inevitable the detection of precessional effects.

00They have an apparent precessional movement, the exact amount of which can be arrived at only by prolonged and toilsome enquiries.

00The astrological zodiac has its roots in the science of astronomy - a legacy from the twelve divisions of the precessional cycle.

00

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