Kight from the rising sun reaches the earth's surface obliquely through different parts of the earth's atmoshphere, suffering unequal refractions. The vertical diametre appears bigger. Therefore, the rising sun appears oval.
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Why does the sun appear to be bigger and brighter than all others stars ?
(a) What is presbyopia ? State its cause. How is it corrected ? (b) Why does the sun appear reddish early in the morning ? Explain with the help of a labelled diagram.
Why does clear sky appear blue ?
Why does the Sun appear reddish at the time of sunset ?
