MifceUanea Cufioja. 15 



Thefe neceffary Things premis'd, let it be 

 propos'd to compute the apparent Place of aay 

 one of the mention'd Comets, for any Given- 

 Time. Therefore, 



1 . Let the Surfs Place be had, and the Log. of 

 its Diftance from the Earth. 



2. Let the Difference between the Time of the Pe- 

 rihelion, and the Time given, be gotten, in Days and 

 Decimal Parts of Days. To the Log. of this Num- 

 ber, let there be added the conftant Log. 9.9601 28^ 

 and the Complement Arithmetical of the I of the 

 Log. of theDifiancein the Perihelium from the Sum 

 The Sum will be the Log. of the Mean Motion, to bs 

 fought in the fir ft Column of the General Table. 



3. With the Mean Motion let there be taken the 

 correfpondent Angle from the Perihelium, in the 

 Table, and the Log. for the Diftance from the 

 Sun : Then in Comets that are Dire ft, add, and 

 in Retrograde ones fubftralt ; if the Time be after 

 the Perihelium, tht Angle thus found, to or from 

 the Place of the Perihelion j or in DireEl Comet s y 

 fubftratJ ; and in Retrograde ones, add \ if the 

 Time be before the Perihelion, the fore faid Angle 

 to or from the Place of the Perihelion ; and f& 

 we ft/all have the Place of the Comet in its Orbit, 

 And to the Log. found for the Diftance, let there 

 be added the Log. of the Diftance in the Perihe- 

 lion, and the Sum will be the Log. of the true 

 Diftance of the Comet from the Sun. 



4. The Place of the Node, together with the Place 

 of the Comet in its Orbit, being given, let the Di~ 

 ftance of the Comet from the Node be found ; then^ 

 the Inclination of the Plane being given, there will be 

 given alfo (from the common Rules of Trigonometry) 

 the Comefs Place reduced to the Ecliptick, the Incli~ 

 nation or Heliocentrick Latitude, and the Log. of the 

 curtate Dl ft mice* 



i 5. Frem 



