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

271
Fig. 77
and the Moon respectively; let MN be the perpendicular
from M on the Grāhaka-mārga or the path of the eclipsing
body (ie. the ecliptic). Then CN is called the Bhuja at
the time.
At the moment of first contact, the value of CN is
√((P+r)²—β²) where β is the latitude of the Moon at that
moment. At any subsequent moment, from fig. 77, CN
is equal to √((P+r—AB)²—β²) where β is the latitude at
the subsequent moment and AB the portion of the radius
of the eclipsed body shaded. Hence we could obtain the
Bhuja at any subsequent moment, by computing the
latitude at that moment and the value of AB. But AB
could be computed only by knowledge of CN and β. Hence