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A44320 Lectiones Cutlerianæ, or, A collection of lectures, physical, mechanical, geographical, & astronomical made before the Royal Society on several occasions at Gresham Colledge : to which are added divers miscellaneous discourses / by Robert Hooke ... Hooke, Robert, 1635-1703. 1679 (1679) Wing H2617; ESTC R4280 276,083 420

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Observations And as the Sun was more advanced in that of this year from 63 to 64 minutes than in that of the year 1631 So it follows that the septentrional Node of ☿ is advanced from 63 to 64 minutes in the space of 46 years as precisely as by the Rudolphin Tables which agree also exactly in the Epochas of the Nodes a matter of no small Importance in Astronomy which hath not a little difficulty to determine with preciseness the Nodes of the Planets and their motions But having compared the observation of Mr. Gallet with that of Mr. Hevelius in 1661. which hapned the third of May in a place of the Zodiac opposite to that of this year he hath found the septentrional Node of ☿ less advanced than the Meridional was in the preceding Observation so that if the Nodes of ☿ in regard of the Sun are precisely opposite the one to the other it appears that they have gone backward since the year 1661. as do those of the Moon and by consequence their motion is sometimes direct sometimes retrograde But if their motion is supposed uniform it will follow that the Line of the Nodes of ☿ doth not pass at all through the center of the Sun but that it is removed from it towards the septentrional limit about a two hundredth part of the Semidiameter of the Orb of Mercury Thus far this knowing and accurate Astronomer Monsieur Cassini who we hear hath since farther discoursed concerning this matter which we hope to procure so soon as he shall make it publick and to add some other curious Observations made by other hands I have as yet been able to procure but one more but that is one so considerable that it will excite the skilful Astronomers anew to ply their Calculations to see what the comparing of this with the rest will produce which as they come to my hands I design to publish as I shall also somewhat of my own Observations thereupon and therefore I omit to make any reflections at present This Letter is of Mr. Edmund Hally now residing at St. Helena directed to Sir Jonas Moore Surveyor of his Majesties Ordnance a person to whom the Learned world is very much obliged for his patronizing and promoting these Coelestial enquiries who hath not been sparing of his own pains and purse in providing the best apparatus of instruments and other conveniences for such Observations the world ever had from whom we may with good reason hope a great advancement towards the perfecting thereof St. Helena Novemb. 22. 1677. HOnored Sir You may with reason wonder that I should so long be negligent to write to your Worship to give you an account of my proceedings since my departure from you seeing that in the business I am now engaged upon the Honorable Sir Joseph Williamson his Majesties Principal Secretary of State and your self are my only Patrons but I have not been unmindful of my Duty in this particular only I delayed that what I sent you might not be altogether inconsiderable I hoped still that we might have some clear weather when the Sun came near our Zenith that so I might give you an account that I had near hand finished the Catalogue of the Southern Stars which is my principal concern but such hath been my ill fortune that the Horizon of this Island is almost always covered with a Cloud which sometimes for some weeks together hath hid the Stars from us and when it is clear is of so small continuance that we cannot take any number of Observations at once so that now when I expected to be returning I 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 higger 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 ⅓ 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. This