Geography
Sirin and her friends were discussing about the celebration of their birthday. Sirin told that she celebrated her birthday once every 4 years and she was sad about that. Everybody got surprised to hear that.
Why Sirin celebrates her birthday once every four years?
Rotation & Revolution
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Answer
Sirin was born on 29th February, a date that only appears in a leap year, which occurs every four years. That's why she gets to celebrate her actual birthday only in leap years like 2016, 2020, 2024, and 2028.
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Identify the phenomena in Northern Hemisphere in this picture.

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Reason (R): Sun provides vertical ray on Tropic of Cancer.
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