What is the maximum length of a day on the poles?

Seasons are caused on the earth due to Its-

The places on the Tropic of Capricorn have the longest day on-

Speed of the light is-

In which region of the earth there is no change of seasons?

The polar diameter of the earth is shorter than equatorial diameter by about-

The distance of the equator from either of the pole is-

On June 21, the sun shines directly on the-

The approximate diameter of the earth is-

One degree of the circumference of the earth measures-