I a Mifcellanea Curiofac 



The Confiruttion and Vfe of the 

 general Table. 



As the Planets move in EMptick Orbs, fo 

 do the Comets in Parabolick ones, having the 

 Sun in their common '.'Focus, and defcribe equal 

 Area's in equal Times. But now becaufe all 

 Parabolas are fimilar to one another, therefore 

 if any determinate Part of the Area of a gi- 

 ven Parabola, be divided into any Number of 

 Parts at Liberty, there will be a like Divifion 

 made in all Parabola V, under the fame Angles, 

 and the Diftances will be pioportional : And 

 confequently this one Table of ours will ferve 

 for all Comets. Now, the Manner of the 

 Calculation of this Table is thus : In the Fig. 



Let S be the Sun y POC the Orbit of a Comet, 

 P the Perihelion, O the Place where the Comet 

 is po gr. diltant from the Sun, C any other 

 Place. Draw the Right Lines CP, CS, and 

 make ST, SR, equal to CS and then having 

 drawn the Right Lines CR, CT, (whereof 

 the one is a Tangent, and the other a Perpen- 

 dicular to the Curve) let fall CQ, perpendicu- 

 lar to the Axis PSR. 



Now; 



