In the movie Contact, aliens from the Vega system contact humans by retransmitting Hitler's August 1st opening speech of the 1936 Summer Olympics, popularly held to be the first radio transmission to make it into deep space.
Taking a wild guess that the broadcast was at high noon in Berlin, the sky from that city would have looked like this (via the planetarium software C2A):
I have helpfully highlighted Vega, centered in the cyan crosshairs.
As you can see, it's right on the horizon. For reasons I won't get into, the exact altitude makes a huge difference in whether a radio signal reaching Vega is merely improbable or outright impossible, and the altitude of Vega depends on the rotation of the Earth. Therefore, the following question:
At what time of day did Hitler make his address?