[MarineBrat]

>>The Goldstone antenna sees the echo first, then Green Bank sees it roughly 20 seconds later.

Saaayyyyy whaaaat?!?

[KarlInOhio]

>>The Goldstone antenna sees the echo first, then Green Bank sees it roughly 20 seconds later.

Saaayyyyy whaaaat?!?

Specular reflection of a location on Venus. The 20 seconds is from how fast Venus rotates and points the reflective point at Green Bank. It doesn't have to do with the speed of light which would only cause milliseconds of difference between Goldstone and Green Bank.