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Happy New Year!

An ancient astronomical instrument in Nanjing, China.
The calendar now in general worldwide use had its origin in the desire for the keeping of time to be consistent with that of our seasons.

When the Sun crosses the celestial equator late in March, the year is calculated to be ~ 365.242199 mean solar days long.  Thus, the vernal equinox is selected for accuracy and is far more important in the keeping of time than midnight, December 31.  Nevertheless the NCB wishes you a happy and healthy New Year.  Enjoy your mathematics.

Tempus fugit!