The Earth's axis rotates (precesses) with a period of about ~26,000 yrs • Hence, while today Polaris is the North Star, this will change over time • This precession happens b.c the Sun & Moon induce a torque that pulls Earth's equatorial bulge toward the eclipticpic.twitter.com/wFxzwPTePl
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Replying to @InertialObservr
Is the mentioned torque vector of Earth co linear with the axis of Earth's rotation?
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Replying to @jmeds2000
The direction of the torque vector is perpendicular to the angular momentum vector and the applied torque .. the torque that induces the circular precession shown above therefore must be perpendicular to the spin axis
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