In the winter, we experience shorter days, earlier sunsets, and longer nights. That is caused because:

The tip of the Earth (the Northern Hemisphere) is pointed toward the sun during Earth's orbit during the summer months, resulting in longer days. Since the Northern Hemisphere is tilted away from the sun during the winter, there are less hours of sunlight and shorter days.

Hope this helps.

this protocol provides a detailed procedure for nucleoprotein extraction from cultured cells and tissues in an efficient manner.