> to adjust for relativistic time drag between Earth surface nominal 1G and sat orbit height gravity That's just the General Relativity correction. There's als

> to adjust for relativistic time drag between Earth surface nominal 1G and sat orbit height gravity That's just the General Relativity correction. There's also a Special Relativity correction to account for time dilation caused by the satellite's speed, which works in the opposite direction to the GR correction yet the two don't exactly cancel each other. Plus there are some others (Doppler shift, Sagnac effect, etc.) https://www.aapt.org/doorway/TGRU/articles/Ashbyarticle.pdf https://www.aapt.org/doorway/TGRU/articles/Ashbyarticle.pdf