Are there two Chinese Valentine's Day this year?

The weather in 2006 is very different-after 7: 00 June, 5438+0, watches and wall clocks need to be set back 1 s, making today the longest day in seven years; It coincides with the leap in July of the lunar calendar. This year, China's traditional Valentine's Day "July 7th" will have a 3 1 and a 38-year "Double Tanabata" on August 30th, which means that China people can enjoy two "Tanabata Valentine's Days". On June 5438+February 3, 2005/KLOC-0, the reporter learned from the Guangdong Astronomical Society that this year, the solar calendar in China is one second longer and the lunar calendar is one month longer, which are called "leap second" and "leap month" respectively.

In 2005, the slow rotation of the earth led to an increase in global demand 1 sec. Because the "Beijing Time" used in China is in the East Eighth District, which is 8 hours earlier than the zero-time zone, the "leap second" in China is inserted into the last 1 second at 7 o'clock today to keep the time accurate.

If the difference is 1 s, some high-precision systems will not be able to connect with other countries in the world that implement leap second, and industries such as aerospace, electronic communication, electric power, finance and transportation may be "stuck"; The time unit of exchange rate changes is between seconds and milliseconds, and the error of 1 second in securities trading may also affect the trading results.

UTC first added leap second in 197 1, and 22 leap second have been adjusted by 1998. Since then, Universal Time and Atomic Time have made an exception for 7 years, with a difference of less than 0.9 seconds, so there is no need to add leap second in the world.

The lunar calendar lasts about 355 days a year, which is about 1 1 day less than the earth. Every three years, the cumulative difference is about one month. At this time, it is necessary to add leap month. The specific leap month depends on the solar terms, and the year with leap month is also called leap year.