1. The earth revolves round the sun in its orbit by approximately 1-degree per day.
2. Solar calendar is Gregorian type of calendar.
3. When the earth reaches its perihelion, then it is nearest to the sun.
4. Broadly, there are three layers of the earth – the crust, the mantle and the core. The crust forms 0.5% of the total volume of the earth.
5. According to Simon Winchester’s book, there are 36 Tectonic plates in the earth.

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