-night by measuring the angular position of a tion of cloud, ship, and sun that is very seldom witnessed, star under normal conditions of atmospheric refraction; to- the brilliancy of the flame, the distinctness of the images at | ' A will increase in proportion, and when the instrument be. and… … nary refraction, nor would it be possible to map any portion the air phantoms, when received, from either side. The the sun, the ship, the water, and the peculiar combination | of the earth’s surface. double image, however, is a phase of the phenomenon which Imagine an engineer triangulating for…
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