Question

What do you mean by standard meridian and Sunspots ​

Answer 1

Standard Meridian is the longitude which is used to describe time of a country. It ideally should be the same for the whole country and all the places in a country should follow this same time. The standard meridian of India is 82.5 ° E and it passes through Mirzapur in Uttar Pradesh.

Sunspots are regions on the Sun's photosphere that appear darker than the surrounding areas on the visible solar disk due to reduced surface temperature associated with concentrations of magnetic field flux and intense magnetic activity on the Sun. They usually appear in pairs of opposite magnetic polarity

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