On this day the sun rises in the southeast, and sets in the south-west, describing the shortest arc in the sky. Over Moscow Sun will rise above the horizon at 8.57 and goes away at 15.58 Moscow time, the duration of the light day will be 7 hours.
For comparison, on the day of the summer solstice, June 22, the light day in Moscow lasts 17 hours 34 minutes.
It is also an ancient pagan holiday.
"Kolyada" is a winter solstice or the longest night of the year. During this period, the young Sun "Kolyada" replaces the old Sun "Svetovit".
Therefore, the light time of the day starts to increase from this day.