. Cyclomathesis : or, An easy introduction to the several branches of the mathematics; being principally designed for the instruction of young students, before they enter upon the more abtruse and difficult parts thereof . makes atJupiter. The periodic time of the firft fatellite is i^ 18*27 34 and that is zr 152854 feconds. And theangle of the penumbra being feconds. There- 5P4 COLLECTION OF Fig. Therefore as 360 deg, or 129600Q the whole : to 152854 the whole time of revo-lution : : fo is 37i/;.5 the angle of the penumbra :to 447/ of time nearly. And therefore all th
. Cyclomathesis : or, An easy introduction to the several branches of the mathematics; being principally designed for the instruction of young students, before they enter upon the more abtruse and difficult parts thereof . makes atJupiter. The periodic time of the firft fatellite is i^ 18*27 34 and that is zr 152854 feconds. And theangle of the penumbra being feconds. There- 5P4 COLLECTION OF Fig. Therefore as 360 deg, or 129600Q the whole : to 152854 the whole time of revo-lution : : fo is 37i/;.5 the angle of the penumbra :to 447/ of time nearly. And therefore all the timethe fatellite Hays in the penumbra, amounts only to44 feconds of time. Cor. The difference of time, between the fatellite*sappearing after its emerging out of Jupiters (hadow,when obferved by the be ft and the worft telefcopes^ cannever amount to 44 feconds ; and very probably not tohalf as much. This matter is eafily tried with two telefcopes ofdifferent goodnefs. But there may be as much dif-ference in the goodnefs of eyes, as in the goodnefsof telefcopes; and reafon tells us not to apply badones of either fort. N ERR A. In page 430inftead of > read 0 I 2 P rA— 1rB — 2 0= A 1= B 2 Prp-l rA—z = A= B. MiscHlwruzs PUSLt/ie-md
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