In the IERS numerical standards , the speed of light in a vacuum is defined as c0 = 299792458 m\/s , in accordance with the SI units .
In 2012 , the IAU redefined it to be simply 149597870700 m . In the IERS numerical standards , the speed of light in a vacuum is defined as c0 = 299792458 m\/s , in accordance with the SI units .