The word 'precession' is correct and commonly used in written English.
It refers to the gradual change in the orientation of the rotational axis of a rotating body, such as the Earth or a spinning top, as it moves through space. Example: "The Earth's precession causes the position of the stars in the night sky to gradually shift over time."
But, although this new hypothesis seems to demonstrate that the ancient Egyptians were unaware of the effects of precession, at least it restores credit for the design of the pyramids where it is due: they were built by ordinary men, using the stars as their guide.
Frame-dragging is predicted to cause an additional precession of one hundred-thousandth of a degree, perpendicular to that caused by the geodetic effect.To measure that, the four gyroscopes in Gravity Probe B are made of fused quartz spheres, which will not expand or contract as the temperature changes.
While experts may argue over which (gyroscopic precession or castor effect) plays a greater role in stablising a bicycle, both have long been considered essential.
This motion is called gyroscopic precession.
Because of precession, before 2000 bce this region would have been invisible from Mesopotamia.
This star catalog relies heavily on that of Hipparchus (129 bc), and in the majority of cases Ptolemy simply converted Hipparchus's description of the location of each star to ecliptic coordinates and then shifted these values by a constant to account for precession over the intervening centuries.
One more complication: the initial drop of the centre of mass carries it too far for a stable plane of precession, and it tends to bounce back up after overshooting.
Once the top tilts, gravity produces a horizontal torque that leads to precession of the spin axis.
In reality, the motion is a bit more complicated than uniform precession in the horizontal plane.
This ancient observation, first explained by Newton, is due to the precession of the Earth's axis.
