MOTION %r THE SUN* S9 



explained by Prieur in his memoir on the morning and even- 

 ing dew (at p. 86, vol. IV. of our quarto feries.) The confider- 

 ations there detailed may be eafily extended to (hew alfo that 

 the effedsmuft be greatly altered, and, in moft inftances, ob- 

 literated by the vicinity of land ; which even changes the re-, 

 gular trade winds into land and fea breezes. 



XIV. 



Abjlrad, of a Memoir on the DireSiion and Velocity of the Motion 

 of the Sun and Solar St/ift€?n. By Dr. Hekhchkl, From 

 thePhilofophicalTranfaaions, 1805. (A.) 



JL HE learned author begins his paper by noticing Dr. Maf- Proper motions 

 kelyne's table of the proper motions of 3G thrs of the firft ^ Jj^!^ ^'^^^ 

 magnitude, and conceives that if this table affords proof of 

 motion in ftars in our immediate neighbourhood, the changes 

 of petition in minute double flars, many of which are only to 

 be feen by means of the beft telefcopes, likewife prove that 

 motions are equally carried on in the remoteft regions of fpace. 



In 1783, the Do6lor deduced from the proper motions of Dedu£lion of a 

 the flars, a motion of the fun and folar fyftem towards X her- ['^"P^J^^^j'JJ^ 

 cules ; and the opinion he then conceived ha& been much dircftion. 

 ■flrengthened by the confiderations ftated in the following pages. 

 Should this dodrine be eftabliflied, many phenomena may be 

 accounted for, which without itmuft remain inexplicable. 



Though it was propofed, by theadmiffion of a folar motion, Confideradoiis 

 to take away many of the proper motions of ftars, by inverting ["chY^'otion. 

 the fun with a contrary one; our author admits that it will re- 

 veal a vaftly greater number of concealed real motions than 

 would be neceffary to admit, were the fun at reft; and that 

 the neceffity for admitting its motion ought therefore to be 

 well eflabliftied. 



The motion of fatellites round their primary planets, and Reafons from 

 of thefe round the fun, fuggefts the idea of a revolution of the ^,"^'^'^sy o^jhc 

 latter round Tome other unknown centre ; nor are we without 

 hypothefes built upon this conjedure,* 



The poffibility of a folar motion has been fhown by the late 



* See Syileme du Monde de Lambert, p, 152, 158. Alfo Phil. 

 Tranf for the year 1783, p. 283. 



Dr. 



