( 99* ) 
I. An Ohfer^^atlon of the end of the 'Total Lunar 
Eclipfe on the ^th of March 1718. ohJcrVed 
near the Cape of Good Hope, JerVmg to deter^ 
ynine the Longitude thereof. With ^markj thereon, 
E. Halley, ^ S, Seer. 
I S no A^ better than thirty Years fince 1 had a 
.1 Difpuce with fome of the French Geographers about 
the Longitude of the Cape of Good FJope, faid to have 
been obferv’d by the Religious Mifllonaries fent to China 
in the Year 1685, By an Emerfion of the firft Satellite 
of Jupiter, they determined that Cape to be 11' or 
I?! grad, more Eafterly than Paris, i\\^i is xograd. from 
London ; Which for the reafons I then gave, \ concluded 
could not be more than i"] grad, ^ See Phil, Tranfa^. 
185. Very lately I have fallen upon an Obfervation 
which I believe will determine the Controverfy in my 
favour: for I had accidentally a Journal of an O dicer of 
the Ship Emperor put into my Hand^, who in his re* 
turn from India, on the fifth of March 1718. obferv’d 
the End of a Lunar Eclipfe, when the vifible altitude of 
the Moons Centre was i}°. x5', he being then in the 
Latitude of 34°. 23' South, and as they found afterwards, 
juft 1 80 Leagues to the Eaft wards of Cape Bonne Efperance. 
By Calculation J find that in that Latitude the Moon 
had that height at yh, iy'~ P. M, and by comparing 
this Eclipfe with that we obferv’d with great exatftnefs on 
Fehr. i\°. i68z. (which agrees perfedly well without 
.Numbers^ I conclude the middle of this to have been 
ijt London at 3^ 48' P,M. To which adding I*’. 46' for 
