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

241 (c) shown in the figure) along the circle of intersection of the Earth with a plane through CO' perpendicular to the plane of the paper, where O₁ is a point on the earth such that SĈO=90° the effect of parallax will be greater and greater in latitude. In other words the parallax has both an effect in longitude as well as in latitude. When it has an effect in longitude only it is called Lambana, whereas, when it has an effect in latitude, it is called Nati. (Thus the translation of 'parallax' as Lambana alone is not fully correct, though at times the parallax may have its com- plete effect in longitude only or in latitude only). For the observer who moves in the ecliptic plane only as the one moving from O' towards O, the parallax will have its entire effect in longitude only and for the observer moving in the perpendicular plane from O' to O₁ mentioned before, the parallax will have its entire effect in latitude only. For observes other than the two above, it will have effect both in longitude and latitude also. When parallax effects longitude the time of conjunction is preponed or post- poned, whereas when it effects latitude, the latitude of the Moon appears to have increased or decreased. When it increases, no eclipse occurs and when it decreases an eclipse does occur. At O', the latitude will be exactly what has been computed; at the point of intersection O'' of the join of the centres of the Sun and Moon with the surface of the Earth, parallax nullifies the latitude and on the great circle O' O'' there will be parallax in latitude only effecting the magnitude of the latitude. It will be seen that for the point O'', the Sun and the Moon are in the zenith, so that neither will suffer from parallax. For the point O the Sun will be on the horizon and the Moon being depressed below the horizon though he is in geocentric conjunction the parallax in longitude or lambana is maximum and the occurence of the New Moon had already elapsed 4 nādis ago. Further