Brocklesby, John, 1811-1889. [from old catalog] · New York, Sheldon and company · leaf 69
iquity, when the luminary is In what direction is an object seen. In passing out of a rarer into a denser medium,flow is the ray bentl What is said respecting the atmosphere ? What is Astronomicalefraction. Explain from figure. Why is the course of the ray a curved and not a brokenline t When is a… … REFRACTION. ll.<5 rays of a star in the zenith fall perpendicularlyupon the atmosphere. The refraction is therefore great-est at the horizon, and constantly decreases with the alti-tude, until at the zenith it becomes nothing. The follow-ing table exhibits the amount of refraction at…
Astronomy
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