Question

What happens to Earth's axis during the winter solstice?

Answer 1

The Sun-Earth-North Pole `angle SEN` is maximum and equals 113.4^o, nearly.

Explanation:

The constancy of the axis' inclination of `23.4^o` to the normal to
the (Earth's orbital plane) ecliptic turns the axis to and fro about the Sun, in the orbital period of 1 year.

At winter solstice North Pole is away from the Sun and South Pole

is closer, for its summer..

At winter solstice (about Dec 21),

the Sun-Earth-North Pole `angle SEN` is maximum and equals

`(90+23.4)^o=113.4^o,` nearly.

At summer solstice (around June 23), this angle is

`(90-23.4)^o=66.6^o,` nearly.