When the eccentricity is large the precessionalrhythm is emphasized; when it is small the precessional effect is weak.
The search of the rocks for records of the ticks of the precessional clock is an out-of-door work.
But the precessional motion pulses steadily on through the ages, like the swing of a frictionless pendulum.
But there are other original rhythms, known or surmised, which might have magnitudes of the same general order, and to discriminate the precessional from these it is necessary to employ other characters.
The effect of its fluctuation is inseparable from the precessional effect, and is related to it as a modifying condition.
If pointed in some other direction, the precessionalforces set up by the rotation of the earth will turn it due north.
As the vessel rolls or pitches, disturbing precessional movements are likely to be set up.
Should a vessel run upon a mud flat it may be rocked by braking or accelerating the precessional motion of the gyroscope.
They have an apparent precessional movement, the exact amount of which can be arrived at only by prolonged and toilsome enquiries.
This fundamental advance rendered inevitable the detection of precessional effects.
For instance, the precessionalmotion of a top cannot be reversed unless we reverse the spin.
The present criterion can also be applied to show that the steady precessional motions in which the axis has a constant inclination to the vertical are stable.
Irregularities in the attracting forces which occasion precession also cause a slight oscillation backwards and forwards over the mean precessional path of the pole, the pole tracing a wavy line or nodding.
The theory of disturbed precessional motion there outlined does not give a convenient view of the oscillations of the axis about the vertical position.
We can hence deduce the condition of steady precessional motion in a top.
The earth's precessional motion is of this latter type, the angles being [alpha] = .
Its bearings are in a frame E C F D which can move about a thwart-ship axis C D with a precessional motion.
Astronomers, beginning with Hipparchus, have made observations of the earth's motion for us, and we have observed the motions of gyrostats, and we naturally seek for an explanation of the precessional motion of the earth.
They are connected by spur-toothed segments J J and J' J', so that theirprecessional motions are equal and opposite.
If the precessional velocity is too small, the top will fall, and as it falls the precessional velocity increases.
Observe that if I do get it tilted a little it does not fall down, but slowly turns with what is called a precessional motion (Fig.
The precessional motion of the ship, or of the gyrostat (Fig.
So that theprecessional motion changes its rate every quarter year from a maximum to nothing, or from nothing to a maximum.
Influence of possible internal fluidity of the earth on its precessional motion, 91-98.
Hence the greater the tilting forces, and the less the spin and the less the moment of inertia, the greater is the precessional speed.
The earth's precessional motion is a gyrostatic effect due to the differential attraction of the sun, which tends to bring the plane of the equator into coincidence with the ecliptic, and so alters the direction of the axis of rotation.
Mr. Hopkins has, therefore, calculated the amount of precessional motion which would result if we assume the earth to be constituted as above stated; i.
We thus see that the average precessional effect of the moon simply conspires with that of the sun to produce a revolution around the pole of the ecliptic.
It will, therefore, be obvious that there is a profound difference between the precessional effect of the sun and of the moon in their action on the earth.
The precessional movement is represented by a revolution around the pole of the ecliptic, as is shown in the figure.
The precessional effect of the moon would accordingly tend to make the pole of the earth's axis describe a circle around that point in the heavens which is the pole of the moon's orbit.
There are only two bodies in the universe which sensibly contribute to the precessional movement of the earth's axis: these bodies are the sun and the moon.
The above list will hopefully give you a few useful examples demonstrating the appropriate usage of "precessional" in a variety of sentences. We hope that you will now be able to make sentences using this word.
