I should actually add that whenever you are doing lab experiments and at places like Ligo to combat the earth movement you gate the measurements to as small a time window as possible.

If you can make an instant measurement the movement of the earth will be negligible the longer the measurement takes the worse the movement error becomes because the more the drift you get.

Last edited by Orac; 10/11/13 11:06 AM.

I believe in "Evil, Bad, Ungodly fantasy science and maths", so I am undoubtedly wrong to you.