Account of an observation of the night ascension and declination of Mercury out of the meridian, near his greatest elongation, Sept.1786, made by Mr. John Smeaton, F. R. S. With AN Equatorial Micrometer, Of His Own Invention And Workmanship; Accompanied With AN Investigation Of A Method Of Allowing For Refraction In Such Kind Of Observations. From the Philosophical Transactions.
Smeaton, John, 1724-1792. | Date: 1787]