,
Example: the Crab Nebula was created by a supernova which was observed in 1054 AD. The distance from the left-side goal line is L = (1054+500)/25=1554/25= 62 yards, which is the 38 yard line on the right side of the field.
© Eric Myers 2012 | License: The image file is licensed under the Creative Commons Attribution-Share Alike 3.0 Unported license. It is a derivative work made in part from the image file AmFBfield.png on Wikipedia, which was created by Wikipedia user Ed g2s.