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Were themedium of our Air much more in quantity, or force ofGravity much greater than it is, or in a word, were the Refractive Power of the Air much more sensible than we find it, nothing could have been a greater Impediment to Discoveries in Astronomy; For all Objects appearing by Refraction higher than really they are, Refraction had been ascertained, it would have been impossible to have been secure of the true observed Place of any Cœlestial Object.

philosophical transactions of the royal society of london

II. Some remarks on the allowances to be made in astronomical observations for the refraction of the air. By Dr. Edm. Halley, R. S. S. Astronomer Royal. with an accurate table of refractions