116 ESSAYS anp OBSERVATIONS 
fem pe Vig 
A Solution of Kepler’s Problem; by Mats 
THF w STEWART, Profeffor of Mathemaz — 
tics in the Univerfity of Edinburgh *. 
HO?’ the problem propofed by the 
celebrated Kepler has been folved 
by feveral mathematicians of great note; 
-Yet, as this is of confiderablie ufe in aftro- 
nomy, it is hoped the following folution 
may be agreeable to fome; as it requires 
a lefs degree of knowledge in the more 
difficult parts of Mathematics than the 
other methods do. 
PROP. I, Tab.V. Fig. t 
Let there be a ftreight line AB, and CD 
a portion of a curve wholly concave 
towards AB; and draw AC, BD parallel 
Same. 
* December 4. 1755% 
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