October 4, 1957 - A very big date. Any guesses why?

[PSP]

(It is still Thursday on the West Coast, so I'm not too late)     October 4, 1957 - Sputnik 1 was launched, becoming the first artificial satellite to orbit the Earth

 

[omeg]

Amazing how far we have come PSP.Thanks for the history.

 

[Mben]

PSP wrote: (It is still Thursday on the West Coast, so I'm not too late)October 4, 1957 - Sputnik 1 was launched, becoming the first artificial satellite to orbit the Earth

First ARTIFICIAL satellite? Oh, in comparison to say the moon (a NATURAL satellite).I should have paid more attention in science class so I wouldn't have to google this stuff. lol

An animation depicting the orbits of GPS satellites in medium Earth orbit.