Simulation of April 21, 2014 Event

[theskyhound]

Its difficult to say how far into the future the GRS position will be accurate. I did implement an extrapolation function that is pretty smart, but the GRS has a tendency to jump sudden in position from time to time, and that would eventually throw it off. Other than something like that, it should be highly accurate for a least a year, and pretty accurate for maybe 5.