3 ms·

This could be measured to some extent without leaving the earth, since the distance to the sun varies by about 3% between perihelion and aphelion.

• simonh 8y ago
  I doubt our detectors are sensitive enough to pick that up, but it’s a good point.
  • lisper 8y ago
    Radiation flux varies as the square of the distance so a 3% change in distance produces a 6% change in flux. That seems to me like it should be detectable (but IANAP).