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Eclipses UPSC NOTE

 Frequencies of solar and lunar eclipses

  • A solar eclipse, especially a total solar eclipse, can be seen from only a limited part of the earth, while the eclipsed moon can be seen at the time of the eclipse wherever the moon is above the horizon.

  • In most calendar years there are two lunar eclipses; in some years one or three or none at all occur. 

  • Solar eclipses occur two to five times a year. Five is exceptional. 

  • There were five solar eclipses in 1935 and will be again in 2206.

  • The average number of total solar eclipses in a century is 66 for the earth as a whole

  • Any point on the earth may, on the average, experience no more than one total solar eclipse in three to four centuries.

  • The situation is quite different for lunar eclipses. 

  • An observer remaining in the same place can see 19 or 20 lunar eclipses in 18 years. 

  • A total lunar eclipse can last as long as an hour and three-quarters, for a solar eclipse, the maximum duration of totality is only seven and a half minutes.

  • This difference results from the fact that the moon is much smaller in cross section than the extension of the earth’s shadow but can be only a little greater in apparent size than the Sun.



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Learnerz IAS | Concept oriented UPSC Classes in Malayalam: Eclipses UPSC NOTE
Eclipses UPSC NOTE
Learnerz IAS | Concept oriented UPSC Classes in Malayalam
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