सिद्धान्तशिरोमणि: गणिताध्याय (भास्कराचार्य - ग्रहगणित, मध्यमाधिकार व स्पष्टाधिकार सटीक)

130 Fig. 9 Eccentric circle theory.—Let E₁ be the earth's centre; let M₁PA₁ be the circular orbit in which the planet (here the Sun or the Moon) moves with a uniform motion. This planet is termed the Madhyagraha or the mean planet. Let M₂A₂P₂ be the actual orbit of the planet whose centre E₂ is removed a little away from E₁. Since the centre E₂ is moved in a vertical direction away from E₁, every point of the eccentric circle (E₂) will be vertically over the corresponding point of the mean circle. Thus M₂ will be the position of the actual planet where M₂ is vertically above M₁ the mean planet. Join E₁M₂ to cut the mean circle in P. Since A₂ is the position of the actual planet farthest from E₁ the Earth's centre, the planet should have