In most places the solstice occurs on December 21st. The North pole is tilted furthest away from the sun, creating long nights in the northern hemisphere and short nights in the southern hemisphere. In the north, this means the longest noontime shadow, with the longest night and shortest day. At the moment that the earth tilt reaches that furthest, there is a pause and then the tilt reverses its course.
The pause is potent, allow for it to create stillness and reflection. Turn off your lights and see what happens. Spend some time during day with only the natural light. Light a candle at night. Pause. Explore the darkness. Pause.