Forty years ago ...

[overconvergent]

Don't you think their hands were shaking
As that rocket ship touched down?
I'm sure they shivered
When they finally touched the ground
And the giant leap so fragile that it hardly made a sound
But it must have been amazing
What a world they got to see ...

(from Walk on the Moon by Great Big Sea)

Forty years ago, on July 21st 1969, the first men walked on the Moon.