526 PHILOSOPHICAL TRANSACTIONS. [aNNO 1 68 1-2. 



Capella. Now taking these observations under the examination of a calculus, I 

 find that at 8h. 6m. or the immersion at London, the true place of the moon 

 correct by parallax was Gemini 4° 32' 24''; but at l6h. 00m. at Ballasore road, 

 the true place of the moon was Gemini 5** 54', that is 1° 2l' 36" more than at 

 8h. 6m. at London: now according to the moon's velocity at that time, she 

 passed an arch of 1° 2l' 36" in 2h. 8m. 40s. of time, so then at loh. 14m. 40s. 

 at London, the moon was in the same place as at l6h. OOm. at Ballasore road; 

 whence the difference of longitude will be 5h. 45 m. 20s. or 86° 20', Ballasore 

 being so much to the eastward of London. 



The same person, in the same ship and place, observed another application of 

 the moon to the same star, on the 23d of December following, in the morning. 

 This was an occultation to most parts of Europe, and was observed at Dantzic 

 by Mr. Hevelius, and at Avignon by Mr. Gallet : the former makes the correct 

 time of the immersion, December 22d, 7h. 46m. 12s. the emersion at 8h. 54m. 

 The latter, the immersion at 6h. 18m. 22s. the emersion at 7h. IQm. 46s. 

 This, as the other, was no eclipse in India, the moon passing to the northward, 

 and by the observation of Mr. Harry, the Bull's Eye and the moon's under-limb 

 were in equal altitude when they were both 13° 45' high to the west, which gives 

 the time 14h. 49m.; and when the south horn of Taurus was 23° 30' high, 

 which makes the time 15h. 13m. the western limb of the moon was in a line 

 with Capella and the Bull's Eye. Now by calculation I find, that at 14 h. 49m. 

 at Ballasore the moon's true place was Gemini 6° 30'30^', and at 7h. 46m. 12s. 

 at Dantzic, the true place was Gemini 4° 55' 1 1'', that is 1° 35' 20'^ short of the 

 place deduced from the observation at Ballasore road, which make in time 2h. 

 32 m. 40s: whence it follows, that 1 Oh. 18 m. 52s. at Dantzic, makes 14 h. 49m. 

 at Ballasore road, and the difference of longitude 4h. 30 m. 8s.; and Dantzic 

 being by many and undoubted observations proved to be 1 h. 15 m. 30s. more 

 easterly than London, Ballasore road will be from London 5h. 45 m. 38 s. or 

 86° 24': and the same difference of meridians will be found 86° 14' if we make 

 use of the emersion at Dantzic. As for the Avignon observation I leave it for 

 those that please to try it, but I dare engage they shall find nearly the same 

 result. N, B. Avignon is Oh. 19 m. 40 s. or 4° 50', to the eastward of London. 



For further confirmation hereof, being on shore at Ballasore town, he observed 

 with very great care and exactness, Nov. 18, the same year, that at 9h. 13 m. 

 the star which Tycho calls, in Cotyla dextra Aquarii duarum prascedens, (and 

 which was then in Aquarius 28° 52', and lat. 2° 46' north), was in a right line 

 with the cusps of the moon, then near the first quarter. The star's place is 

 confirmed by the agreement of Hevelius's observations with those of Tycho, 

 and the theory of the moon cannot be considerably faulty in that part of her orb. 



