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his aforesaid Preface, he saith, That were the place of Mercury's Node once found, from this his Observation of Mercury, the Suns Parallaxis might be deduced.
Hereto are added, by our Author,
Modi quidam penè Geometrici pro Parallaxi Lunæ investiganda.
Of which, there are three proposed, Yet the best way of finding the same (as the Author noteth in his Preface) would be, by comparing the Meridian Altitudes of the Moon, observed both in St. Helena and in Europe at the same time.
The concluding Chapter is entitled,
Quædam Lunaris Theoriæ Emendationem spectantia.
Wherein it is (as is noted in the said Preface) that Astronomy is at present most of all defective. And that the discovery hereof would lead us to the most exact way of finding ou the Longitude of places.
LONDON,
Printed for John Martyn, Printer to the Royal Society. 1679.
