VOL. LIX.] PHILOSOPHICAL TRANSACTIONS. 67 1 



Solar Eclipse. 



1769 March 31 Beginning 20* 58"" \6' 20* 54" 15' 9" 



Gr. obs 22 19 3 22 15 2 



End 23 46 55 23 42 52 



1769 Nov. 6. Alt. of a "s 



S '« west limb. Merid. under limb. Parts of 96. 



parts, 

 6" 52" 6' 20° 4-' 36"+ 22° 1' 14 

 Thermom. 

 Barom. within, without. This is the only one of the moon since the qua- 

 inches. drant was in order. 



29.66 41)" 46° 



The equation of time made use of, is taken from De la Caille's Ephemeris. . 



Observations of Eclipses of Jupiter s First Satellite, proper to be compared with 

 the foregoing ones, in order to determine the Difference of Meridians of Green- 

 wich and Glasgow. Communicated hy tlie Astronomer Royal. 



apparent time. 



J752 Sept. U Im. 11* 12" 43' Suny-street, 2 feet reflector. By N. Maskelyne. 



Oct. 4 Im. 11 31 1 Surry-street, 2 feet reflector. Observed by J. Short. 



Nov. 3 Em. 15 56 57 J Greenwich, 6 feet reflector. By C. Green. 



12 Em. 12 10 56 Surry -street, 2 feet reflector. By J. Short. 



1763 Oct. 16 Ira. 11 27 39 Surry-slreet, J feet reflector. By J. Short. 



Nov. 1 Im. 9 45 25 Surry-street, 2 feet reflector. By J. Short. 



1764 4 Im. 13 3 37 Greenwich, 2 feet reflector. By C. Green. 



10 Im. 14 57 11 Greenwich, 6 feet reflector. By C. Green. 



1765 Feb. 19 Em. 13 46 42 Greenwich, 6 feet reflector. By C, Green, good observation, 

 Dec. 1 Im. 10 40 U Greenwich, 18 inch reflector. ' T 



.... 8 Im. 12 31 34 Greenwich, 6 feet reflector, air very clear. 



15 Im. 14 22 3 Greenwich, 6 feet reflector. >By N. Maskelyne 



.... 22 Im. 16 12 19 Greenwich, 6 feet reflector. [ 

 24 Im. 10 39 27 Greenwich, 6 feet reflector. J 



1766 April 11 Em. 11 56 30 Greenwich, 6 feet reflector. By J. Dymond. 



The late Mr. Short's house in Surry-street, where some of the above observations were made, is 

 26'i of time west of Greenwich. 



LVIl. Extract of a Letter to the Rev. Nevil Maskelyne, Astronomer Royal. 

 From Mr. Benedict Ferner, F.R.S. Dated Stockholm, JuneQ, 17 6g. Trans- 

 lated from the French, p. 404. 



I am more surprized that the times of the contacts of Venus and the sun's 

 limbs, observed here, by different observers, with different instruments, agree 

 so near together, than I am at their difference; for the nearness to the horizon, 

 and the extraordinary quantity of vapours with which the atmosphere was then 

 loaded, not only caused the limb of the sun to tremble and undulate, but also 

 give it as it were the form of a large saw, the eminences being luminous and 

 the cavities black, which shifted places like the waves of a tempestuous sea. 



There was no reason for fixing the moment of the ingress of Venus sooner 

 than she had made a greater cavity in the limb of the sun than the depth of the 

 waves or black notches; and then one might be very sure of the fact: but cer- 



