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Explain why Christmas comes in the summer in Australia?

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The Earth revolves around the Sun in an elliptical orbit, called ecliptic. The revolution period is ~365.25 days. The Sun is located at one of the two focii of the orbit. The position of maximum separation of the Earth from the sun is called apogee and the closest distance is called perigee. Along with this movement, the Earth also rotates about it's axis with a period of ~24 hrs. The axis of ...