Taian is located in the northern hemisphere, in the east of Asia and in the middle of Shandong Province. Its coordinates are: north latitude 1 16 02' to 1 17 59', and north latitude is 35 38' to 36 28', belonging to temperate semi-humid monsoon climate zone.

Generally, the summer to sunset is on June 2 1 or 22 every year, which is the longest day, and the farther north it is, the longer it is.

Generally speaking, the annual winter solstice is between 65438+February 2 1-23. This day has the shortest day and the longest night.

So according to this time, 9.9 Teachers' Day, 10. 1 National Day and 6. 1 Children's Day are all around the summer solstice.

Only New Year's Day is near the winter solstice, so New Year's Day is the shortest.

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I wonder if it meets your requirements.