OBA Practice Questions - 29a Olimpíada Brasileira De Astronomia E Astronáutica - 2026 Exam

What physical mechanism causes the precession of the equinoxes, which has a cycle period of approximately 25,772 years?

Gravitational torque exerted by the Moon and the Sun on Earth's equatorial oblateness (bulge) Magnetic torque generated by the interaction between the solar wind and Earth's liquid outer core dynamo Relativistic frame dragging of spacetime caused by the rapid rotation of the Sun Tidal friction between the oceanic water masses and the ocean floor shifting Earth's center of mass

Correct Answer:

Gravitational torque exerted by the Moon and the Sun on Earth's equatorial oblateness (bulge)

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