VOL. XXVII.] 



PHILOSOPHICAL TRANSACTIONS. 



549 



The Place of the Moon at this Time, from Sir Isaac Newton*s Theory. 



Mean motion of the moon. 

 Annual equation subtract . . 



4» 26^ 57' 37" 

 8 34 



Mean anomaly 5* 1 6° 9' &' 



Equation of centre subtract 1 53 31 



Moon's place the 4th time equated 4 24 58 19 

 The variation, add 11 



Moon's place the 5th time equated 4 24 58 30 

 The 6th equation from the distance 



of the luminaries and apogee, add 1 20 



The correct mean motion 4 26 49 3 



Mean motion of apogee 11 18 13 54 



Annual equation of apogee add 14 31 



Correct mean motion of apogee . . 11 18 28 25 

 Second eq. from the distance of ap. 



from sun add 2 57 



Place of the moon the 2d time eq. 4 26 52 Moon's place the 6th time equated 4 24 59 50 



Mean motion of node 11 1 34 25 The 7th equation add 34 



Equation of node subtract 6 54 True place of the moon in her orbit 4 25 24 



True place of the sun 10 24 55 50 



Correct mean motion of node .... 1 1 1 27 3 1 ■ i. 



The 3d eq. of the moon from nodes Moon beyond the opposition ... 4 34 



aspect with the sun subtract ... 10 Which divided by the horary motion 



■ of moon from sun, gives 7 42 



Place of the moon the 3d time eq. 4 26 51 50 



Second equation of apogee subtiact 7 4541 d h m s 



The mean time therefore of op. Feb, 2 10 47 6 



True place of apogee 11 10 42 44 And the true time 2 10 32 20 



The Place of the Moon at the same Time from the Tables in Mr. Whiston's 

 Astronomy, according to Mr. Horrox's Theory. 



Place of moon in ecliptic 4°24'57"27"' 



Reduction between the true opposi ■ . 



tion and middle of eclipse, add . . 2 47 



d h m s 



Middle of eclipse 2 10 43 34 



Continuance of eclipse 2 55 6 



Digits eclipsed 9 55 



Beginning of eclipse 2 9 I6 1 



End of eclipse 12 11 7 



Mean motion of the moon 4» 26° 57' 37" 



Physical parts subtract 821 



Correct mean motion 4 26 49 1 6 



Mean motion of apogee 11 18 13 54 



Equation of apogee subtract .... 7 25 



Mean anomaly 5 I6 22 



Equation of the centre subtract . . 1 53 53 



Place of the moon in her orbit . . 4 24 55 23 



Distance from the opposition 27 



That is in time to be added 45-i- 



The mean time of true opposition is a h m s 



exactly 2 10 55 33 



The apparent time 2 10 40 41 



End of eclipse by the moon's place 



from Newton's theory 12 2 



End by observation 12 1 



End by calculation from Horrox's 



theory 12 11 





 30 



The error therefore of Sir Isaac Newton's theory is, by this observation, 

 only half a minute, or none; of Horrox's system, 9 minutes and a half. 



Microscopical Observations on the crystallized Particles of Silver dissolved in 

 Aquafortis. By M, Leuwenhoeck. N° 325, p. 20. 



After having examined the coagulation of those particles found in aquafortis 

 impregnated with silver, and shown that they had assumed the figure of so 



