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Mathematical Methods for Astrological Timing

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Multiple Choice

What is the mathematical formula for calculating the sidereal period of a planet?

  1. $$T = \frac{2\pi}{\sqrt{\frac{G M}{a^3}}}$$
  2. $$T = \frac{2\pi}{\sqrt{\frac{G M}{r^3}}}$$
  3. $$T = \frac{2\pi}{\sqrt{\frac{G m}{a^3}}}$$
  4. $$T = \frac{2\pi}{\sqrt{\frac{G m}{r^3}}}$$
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