" 26.Why sun has elliptical shape on the time when rising and sun setting "

Why sun has elliptical shape on the time when rising and sun setting ? It is due to

Why the sun looks red at the time of setting ?

The reddish appearance of rising and setting sun is due to

Explain why the setting sun looks red?

A planet moves around the sun in an elliptical orbit. When earth is closest from the sun, it is at a distance r having a speed v . When it is at a distance 4r from the sun its speed will be:

The colour of the sun is reddish during the sun rise and sunset. Explain why ?