The Winter Solstice occurs exactly when the earth's axial tilt is farthest away from the sun at its maximum of 23° 26'. Though the Winter Solstice lasts only an instant in time, the term is also colloquially used as Midwinter or contrastingly the first day of winter to refer to the day on which it occurs. More evident to those in high latitudes, this occurs on the shortest day, and longest night, and the sun's daily maximum position in the sky is the lowest. The seasonal significance of the Winter Solstice is in the reversal of the gradual lengthening of nights and shortening of days. Depending on the shift of the calendar, the Winter Solstice occurs on December 21 or 22 each year in the Northern Hemisphere, and June 20 or 21 in the Southern Hemisphere.

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The Winter Solstice occurs exactly when the earth's axial tilt is farthest away from the sun at its maximum of 23° 26'. Though the Winter Solstice lasts only an instant in time, the term is also colloquially used as Midwinter or contrastingly the first day of winter to refer to the day on which it occurs. More evident to those in high latitudes, this occurs on the shortest day, and longest night, and the sun's daily maximum position in the sky is the lowest. The seasonal significance of the Winter Solstice is in the reversal of the gradual lengthening of nights and shortening of days. Depending on the shift of the calendar, the Winter Solstice occurs on December 21 or 22 each year in the Northern Hemisphere, and June 20 or 21 in the Southern Hemisphere.

Worldwide, interpretation of the event has varied from culture to culture, but most cultures have held a recognition of rebirth, involving holidays, festivals, gatherings, rituals or other celebrations around that time.

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In 46 BCE, Julius Caesar in his Julian calendar established December 25 as the date of the winter solstice of Europe (Latin: Bruma). Since then, the difference between the calendar year (365.2500 days) and the tropical year (365.2422 days) moved the day associated with the actual astronomical solstice forward approximately three days every four centuries, arriving to December 12 during the 16th century. In 1582, Pope Gregory XIII decided to restore the exact correspondence between seasons and civil year but, doing so, he did not make reference to the age of the Roman dictator, but to the Council of Nicea of 325, as the period of definition of major Christian feasts. So, the Pope annulled the 10-day error accumulated between the 16th and the 4th century, but not the 3-day one between the 4th AD and the 1st BC century. The Pope's change so finally fixed a calendar bringing the northern winter solstice to around December 22. Yearly, in the Gregorian calendar, the solstice still fluctuates slightly but, in the long term, only about one day every 3000 years.

The figures in the charts show the differences between the Gregorian calendar (Figure 1: using 1 leap year per 4 years) and Persian Jalāli calendar (Figure 2: using the 33-year arithmetic approximation) in reference to the actual yearly time of the winter solstice of the northern hemisphere, the December solstice. The Y axis is "days error" and the X axis is Gregorian calendar years. Each point represents a single date on a given year. The error shifts by about 1/4 day per year, and is corrected by a leap year every 4th year regularly, and in the case of the Persian calendar also one 5 year leap period to complete a 33-year cycle, keeping the Persian winter solstice holiday on the same day every year.