Well, we hope that today is one that will be long remembered for the successful flight of the Falcon Heavy.
At about 10:30 am Pacific time, if weather and technical issues allow, SpaceX will attempt to flight the Flacon Heavy, which is essentially three Falcon 9 strapped together. Unlike other large rockets with large side boosters, SpaceX, as they have done on a number of Falcon 9 missions, will attempt to recover the rockets after flight, landing two of them back at the Kennedy Space Center and the center rocket on the floating barge, Of Course I Still Love You.
The upper stage, after loitering in orbit for six hours will boost the test payload into an elliptical orbit that nears, but does not intersect with the planet Mars. That upper stage will not be recovered and the payload will coast between Earth and Mars into the indefinite future.
Here’s video from SpaceX, with a hat tip to the late David Bowie, showing the planned mission.