Due to the finite speed of light, observers in different locations or
moving with respect to one another may see events as occurring in
different orders—simultaneity depends upon your viewpoint.
You've heard the mission control recording of Apollo 11
landing on the Moon, but what did it sound like on board the
lunar module?
This document
demonstrates the relativity of simultaneity and lets you experience
the Eagle's touchdown from a lunar perspective, providing
an insight about Neil Armstrong's first radio transmission after
the landing.