# Page:Philosophical Transactions - Volume 095.djvu/273

In the next place, if we admit Sirius to be a very large star situated at the distance 1,6809 from us, and compute its elongation from the apex of the solar motion, we shall find it 138° 50' 14",5. With these two data we calculate that its parallactic motion will be ${\displaystyle {\tfrac {\phi \cdot s}{r\cdot d}}=sp=}$ 1",11528; and this also agrees with the apparent motion which has been ascertained by observation as the proper motion of Sirius.