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→The Law of Periods
[[Image:Gravitation%20for%20wiki_html_m290004f7.gif]] <br>
[[Image:Gravitation%20for%20wiki_html_m290004f7.gif]] <br>
<math>G m_1*M_s / r^(12) = m_1*(v^(12))/ r_1</math>
<math>G m_1*M_s / (r_1)^2 = m_1*(v_1)^2/ r_1</math>
<math>v_1 = 2πr_1/T_1</math>
<math>v_1 = 2πr_1/T_1</math>