272 PHILOSOPHICAL TRANSACTIONS. [aNNO 1717. 



Yet Mr. Folkes, with some members of the Royal Society, saw at London 

 on Jan. 1 1 at 8^ P. M., Jupiter's centre, at the distance of one diameter of his 

 body, follow the fixed star, which was more northerly than the said centre 

 about three quarters of his semidiameter. Afterwards Jupiter was covered with 

 clouds; but from his motion Mr. Folkes concluded, that the star was in con- 

 junction with Jupiter a little after midnight, and hid by the northern part of 

 his disk. 



At Westminster, Mr. Desaguliers and Mr. Gray saw the fixed star at 6 

 o'clock in the evening, distant an entire diameter of Jupiter from his limb, 

 towards N. W. Whence, and from the observations made the following days, 

 it appears that the conjunction happened about midnight. 



AtWansted, Mr. Pound made the following accurate observations, with a 

 pretty long telescope and a micrometer. Jan. 5, at 5^6"^ equated time, Jupiter's 

 centre was distant from the said fixed star 3l' 49'', which at 5^ 38"^ it followed, 

 34' \1" of right ascension; and at the same time the southern limb of Jupiter 

 had the same declination with the star. 



Jan. 9, at 6*^ G'" Jupiter's centre was distant from the star 10' 49', and 8 

 minutes after, the difference of right ascension was 1 V Z1"\ at which time the 

 planet's centre was but a small matter more southerly than the star. 



Jan. 11, at 5^ 30™ equated time, the distance of their centres was 1' ^A"\ 

 and at the same time the star was seen more northerly than Jupiter's centre 

 about one-fourth of his diameter, and Jupiter's least diameter was found to be 

 43'^: then clouds came on. 



Jan. 12, at 5^ 17*", the distance of the centres was 3' T''. and at 5*^ 50™ Jupier 

 preceded the star 3' 30''' of right ascension ; and at the same time the northern 

 limb of Jupiter had the same declination accurately with the fixed star. 



It is manifest from comparing these observations, that this fixed star was in 

 conjunction with Jupiter on Jan. 1 1, at about 13**, and only 17'" or 18'''' more 

 northerly than his centre, and consequently hid by him. 



This fixed star, though hitherto in no catalogue, was then in 22° 13' of 

 Gemini, with 13-^' S. lat. and had a star accompanying it, that preceded it 17', 

 and was f more northerly, or in 21° 56' of Gemini, with ^^ S. lat. with which 

 Jupiter seemed to be in conjunction on the l6th of January at 6*^ 30™ in the 

 evening. Thus in less than two months time, Jupiter eclipsed with his body 

 two fixed stars, of which there is not one single instance extant since the inven- 

 tion of telescopes; consequently such observations are of great value, and 

 worthy to be transmitted to posterity. According to Gassendus's observation, 

 our little star was in conjunction with Jupiter, when stationary, Feb. 6, l634, 

 and more southerly by three of his diameters; whence it will appear, on a just 



