The Japan earthquake shortened the day length by 1.8 microseconds. [1]
1.8 microseconds * 365.25 days * 20 years =~ 0.01 seconds off. Not enough to require an update, even less an urgent update before the 20 years.
1.8 microseconds * 365.25 days * 761 years =~ 0.50 seconds off.
[1] http://www.space.com/11115-japan-earthquake-shortened-earth-...
The Japan earthquake shortened the day length by 1.8 microseconds. [1]
1.8 microseconds * 365.25 days * 20 years =~ 0.01 seconds off. Not enough to require an update, even less an urgent update before the 20 years.
1.8 microseconds * 365.25 days * 761 years =~ 0.50 seconds off.
[1] http://www.space.com/11115-japan-earthquake-shortened-earth-...