212 Mr. Squire o?j the OccuUation of Venus in F«hruary. 



any change like this, took place in the atmospheric pressure, 

 on the 17th of July last, over any part of the British isles. 

 And therefore, setting aside the relative situations of the two 

 places it must be inferred that either Mr. Weekes's baro- 

 meter is extremely defective, or that the observations were 

 made without sufficient regard to accuracy, and for that rea- 

 son are unfit for the purpose intended. 



I have with great pleasure read Mr. Daniell's excellent 

 work, entitled '• Meteorological Essays," and in justice I can 

 truly say that great credit is due to that gentleman, for his la- 

 borious and scientific researches relative to meteorology : — 

 his valuable illustrations of the general laws and phasnomena 

 of our atmosphere; — his unremitted attention to the impro- 

 ving and perfecting of the various instruments connected with 

 this bi"anch of philosophy, entitle him to the highest praise 

 and thanks of all true lovers of science. 



I remain, Gentlemen, yours truly, 

 Epping. Jan. 4th 1827. Thomas Squire. 



XLIII. On the expected OccuUation of Venus in February. 

 By Thomas Souire, Esq. 



To the Editors of the Philosophical Magazine and Anfials of 

 Philosophy. 

 Gentlemen, 



/^N reading Mr. Baily's introductory remarks to liis valu- 

 ^-^ able list of moon-culminating stars, he says, " You will 

 observe that I have inserted Jupiter antl Saturn, when they 

 are near the moon, and when their motion is retrograde : and 

 also Venus on the day of her occultation in February." 



Now with respect to the d of ? and the ]) , on the morn- 

 ing of the 22nd of February, it appears from tlie result of com- 

 putations which I made relative to this 6, for Moore's Alma- 

 nack of the present year, that this will not prove to be an oc- 

 cultation at Greenwich. For at the time of visible d, (which 

 happens at 33™ after 9, apparent time,) the apparent latitude 

 of $ exceeds that of the moon 17' 57"; and if from this we 

 take the sum of the apparent semidiameters of the moon and 

 Venus, it will leave 1' 29"-4, for the distance of the J 's north- 

 ern limb from the southern limb of Venus. But the nearest 

 approximation in this respect will be 1' 8"*4', as seen from 

 the Royal Observatory. 



Hence we may conclude that there will not only be no 

 occultation at Greenwich, but that this will also be the case 

 in every other part of England. 



It is to be hoped the atmosphere will prove favourable for 



verifying 



