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A44321 Lectures and collections made by Robert Hooke. Hooke, Robert, 1635-1703. 1678 (1678) Wing H2618; ESTC R23972 80,779 142

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have not finished above half my intended work and almost despair to accomplish what you ought to expect from me I will yet try two or three months more and if it continue in the same constitution I shall then I hope be excusable if in that time I cannot make an end However it will be a great grief to be so far frustrated in my first undertaking I have notwithstanding had the opportunity of observing the ingress and egress of ☿ on the ☉ which compared with the like Observations made in England will give a demonstration of the Suns Parallax which hitherto was never proved but by probable arguments Likewise I have seen those two Eclipses one of the Sun the other of the Moon in May last both which I send you but the mighty winds and extraordinary swift motion of the Clouds hindred the exactness of the Observations That of the Moon may help for the difference of our Meridians which is about 7 degrees to the Westwards of London but it may more curiously be found by Mercury sub Sole There are three Stars of the first Magnitude that never appear in England but none near the South Pole of any brightness except one of the third Magnitude which is about ten degrees distant from it The two Nubeculae called by the Saylors the Magellanick Clouds are both of them exactly like the whiteness of the milky way lying within the Antartick Circle they are small and in the Moon shine scarce perceptible yet in the dark the bigger is very notable I need not relate unto you the temperature of the Weather for heat and cold here in the Torrid Zone you your self having long since had experience of a Latitude little different only this I shall certifie you that ever since I came to this Island we have had no weather that is hotter than the Summer of England is ordinarily Mr. Clark is a person wonderfully assistant to me in whose company all the good fortune I have had this Voyage consisteth to me all other things having been cross nevertheless I despair not of his Honors and your Worships favour which alone is sufficient to encourage me to bear with patience these disappointments and expect some fitter opportunity I am your Worships most obliged Servant and true Honorer Edmund Halley St. Helenae Latitudo Australis 15. 55. Anno 1677. Octobris 28. die ☉ mane ☿ apparuit intra ☉ h. m. s.   9 26 17 Pars aliqua corporis ☿ ii intrasset Solem decem gradus à nadir ad dextram circiter 9 27 30 Formabat angulum contactus totus ☿ scilicet intus 2 38 39 Limbus ☿ ii proximus dissiti à limbo Solis sui Diametro 2 40 8 Limbus ☿ ii tetigit limbum ☉ 2 41 0 Centrum ☿ exiit è Sole 30 grad circiter à Nadir ad dextram 2 41 54 ☉ limbus integer factus Longitudo Latitudo trium Stellarum illustrium prope polum austrinum   Long. Latit Canopus 11 3 ♋ 75 49 Centauri pes 25 24 ♏ 42 22 Alcarnar 10 31 ♓ 59 18 1 3. The Period of the Revolution of Jupiter upon it Axis verified by new Observations made by Monsieur Cassini Extracted out of the Journal de Scavans THE Globe of Jupiter whose Revolution about its Axis was determined by the Observations of Monsieur Cassini in the Year 1665. to be 9 hours and 56 minutes is as it were a watch for visibly pointing the hours and minutes to half the Earth at once so that it shews the same time to all under the same Meridian and a different time to different Meridians according as they differ in Longitude It hath for an Index of its motion one principal spot which is very neatly distinguished from the rest of its surface and seems from its figure and situation to have some resemblance to the Caspian Sea of the Terraqueous Globe By the help of good Glasses it may be seen passing the under Hemisphere of it from the East to the West with a velocity so sensible that one may determine to one or two minutes the time that it comes to the middle of the Disc which is the place the most fit for establishing of the Epochas and for finding the difference of Longitude There may be a great number of such Revolutions observed since in one year of 365 days there are made 882 Revolutions But it doth not appear in every year but as if it were some kind of Marish which is dried at certain times and so disappears during two or 3000 Revolutions and after it hath remained thus imperceptible for some years it returns again to its former state After it had been observed the last six months of the year 1665. and some months of 1666. it became invisible till the beginning of the year 1672. then being returned to its former appearance Monsieur Cassini compared the intervals of the six years and limited the revolution to be made in 9 hours 55 minutes 51 seconds and continuing his Observations to the end of the year 1674. he found by these two years that it was too slow by two seconds and a half so that it appeared to be in 9 hours 55 minutes 53 ½ seconds This spot hath been invisible in 1675. and 1676. during which space there happened other very considerable changes in the body of Jupiter for the clear interstice which was between the two dark belts of Jupiter was separated into many little parts in the manner like so many Islands as if the two obscure belts had been two great Rivers broken one into the other and had left these parts which appeared like Islands which yet were at last all effaced and the two dark belts and the interjacent space at length all coalesced into one large belt But after the coming of Jupiter out of the Rays of the Sun in the year 1677. the belts again took their form and situation which they had heretofore to wit the same which is described in the 24 figure The principal spot appeared anew after the beginning of July last Monsieur Cassini found this spot in the middle of Jupiter the night after the eighth of the said month at 13 minutes after one at night and hath hitherto ever since observed it at the hours proper to its revolution Having compared many Observations of this year with as many others made the same days of the year 1665. for avoiding the scruples which may arise from the inequality of times he hath found by the intervals of twelve years that those revolutions compared the one with the other complete themselves in 9 hours 55 minutes 52 seconds and 5 or 6 thirds And because that in the years 1672 1673. they appeared more slow by 2 seconds and a half during the time that Jupiter was in its greatest elevation from the Sun Monsieur Cassini inclines to suppose that these revolutions have some little inequality depending on the variation of the distance of ♃ from the ☉ and that