Question

why are the days sometimes longer and sometimes shorter​

Answer 1

This phenomenon occurs because the Earth's axis is not straight up and down at a 90 degree angle, but it is instead tilted a bit. Therefore, as the planet orbits the sun every 365 days, sometimes the Northern hemisphere is closer to the sun (summer) while sometimes it is farther away (winter).

Answer 2

Answer:

longer day 25 December

shortest day 29 January