"Being off even a little bit represents hundreds or thousands of kilometers in distance on the surface of the Earth."

A failed Soviet Venus probe from the '70s crashed to Earth in May — why was it so hard to track?

Source: space
Source Link: https://www.space.com/space-exploration/launches-spacecraft/a-failed-soviet-venus-probe-from-the-70s-crashed-to-earth-in-may-why-was-it-so-hard-to-track