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M. de la Lande having announced to some of my astronomical friends the utility of accurate observations of Mercury, at his two elongations the last year, in August and September; I tried to get observations of that planet in crossing the meridian, for some days before and after the greatest elongation in August; and though the state of the atmosphere about that time was not very favourable to the purpose, yet there was one day that I thought unexceptionable, but could not perceive the least appearance of Mercury; at which i was the rather surprised, as I had formerly seen that planet in the like situation, with the same instrument, with perfect perspicuity: and as i did not hear of any one else having succeeded in this observation, I thought it might be very possible for the same disappointment again to happen, with respect to the approaching elongation in September.

philosophical transactions of the royal society of london

XXXIII. Account of an observation of the right 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; communicated to the Rev. Nevil Maskelyne, D. D. F. R. S. and Astronomer Royal, and by him to the Royal Society