When is the day added?
Sunlight is necessary and useful to man. Lack of it during the winter is bad for the body. The nights are longer and the days are shorter. But this situation is periodic, which is why everyone wants to know exactly when the day is added.
The increase in the length of daylight comes after the winter solstice. At this moment, the shortest light day is recorded. This is scientifically explained by the fact that the Sun these days passes the most distant point of the Earth's orbit. This is influenced by the shape of the circle in which the planet moves: it has a slight degree of elongation of the ellipse.
The winter solstice in the northern hemisphere falls on the month of December - 21 or 22 numbers. The displacement of the date of the solstice is influenced by leap shifts and the dynamics of the moon. In the southern hemisphere during this period the summer solstice occurs.
The position of the Sun a few days before and after the solstice, does not change its declination. And only after 2-3 days, the increase in daylight begins.At first, the increase passes almost imperceptibly (several minutes a day), but with an increase in the speed of rotation of the Sun, the added time increases.
Thus, the date when the day begins to increase in the northern hemisphere falls on December 24-25. The time of daylight is added up to the day of the summer solstice. The longest day falls alternately on June 20, 21, 22.