In what frame of reference?
Speed of light works just fine.
Is a meter constant? Yes.
Is the speed of light constant? Yes.
Is time constant? Yes.
So figure out the distance light travels in one second.
Then work out the apparent speed the earth is traveling at that very second. Then use this information and compare it to the speed of light. According to FET, the Earth's acceleration has led it to be traveling faster than the speed of light. Nice one.