What does the sentence "1929" mean?

"1929 Don't make a move" is catchy: 1929 Don't make a move, walking on the ice in 3949. Five, nine, six, nine, look at the willows by the river. Seven or nine rivers have opened and eight or nine swallows have come. 99 plus 19, plowing cattle everywhere.

"Don't do it in 1929" is from 1999 solar term song. From the winter of 1929 to the first 18 days in the future, the weather became cold rapidly, and it was too cold to be outdoors.

The scope of application of the number nine

The method of calculating cold and warm by number nine is suitable for areas where the temperature changes obviously from winter to around in China. The calculation of temperature and warmth changes is accurate to days. Judging from the number of days from winter to Sunday, the coldest period is "March 9, April 9", while counting to "998 1 day" is a late spring and warm day.

There are also some places that count to nine from the day of winter solstice. In some cold areas, the temperature in winter and spring is below zero degrees Celsius for a long time in the ice and snow, and the temperature change is not obvious from winter to around. "Nine days" is not much different from the temperature. For the convenience of counting nine, counting begins from the date of winter solstice, that is, the date of winter solstice is called "cross nine", every nine days is "nine nine", and so on.