I came across this opening sequence to the 1979-1980 Buck Rogers syndicated show on YouTube. Who didn't like Buck Rogers.
Here you see Buck's shuttle launch and a brief mishap sends Buck Rogers out of his trajectory and returns him to earth "500 years later."
Seeing the clip you see his ship launched in the year 1987 and return 2491. This show definitely brings back memories.
But if you do the calculation:
1987 > 2491 = 504 years
This video and many similar were squashed by YouTube. However, you can see the full episodes at Hulu.Com. The made for TV movie (the revised theatrical version) is titled The Awakening - it has the opening intro. and, if interested, you'll see that the answer to this math puzzle is correct if this video is not already removed. http://www.hulu.com/watch/14898/buck-ro ... ing-part-1
Updated 12.26.17. New link.