Effects of Refraction Dip and Parallax

The atmosphere not only affects the amount of light transmitted to the eye, but it also changes the position in the sky at which objects can be seen. The bending of light in an optical medium like air is known as refraction. The phenomenon has been known for centuries. It is mentioned by the Greek astronomer Cleomedes (1st century a.d.), and Ptolemy (~150 a.d.) independently describes the effect of refraction on starlight in his book Optics. Augustine (~340 a.d.) mentions the apparent bending of a stick in water as evidence of the deception of the senses—an argument that was still being made by traditionalists to discredit the telescope findings of Galileo in the 17th century.

Atmospheric refraction causes the altitudes of distant terrestrial and astronomical objects to appear higher than they

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Responses

  • thomas
    What is parallex effect of refraction?
    1 year ago

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