What change begins to occur in the Northern Hemisphere immediately following the Winter Solstice?

Answer

The addition of infinitesimally more daylight each successive 24-hour period.

Once the point of maximum tilt away from the Sun is reached, the slow, steady process of returning light begins, adding microscopic amounts of daylight each day.

What change begins to occur in the Northern Hemisphere immediately following the Winter Solstice?
lightseasonYeardaySolstice