Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2015 6 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/21/2015   22:38:29   (   0.07,-134.44) (  -0.60,-137.49)  347.54                80
 06/22/2015   22:22:24   (   0.06,-134.48) (   0.40,-132.96)  173.63                80
 06/24/2015   10:41:31   (  -0.08,-134.57) (   0.74,-138.23)  417.70                80
 06/25/2015   10:25:25   (  -0.07,-134.61) (  -0.25,-133.70)  103.29                80
 06/26/2015   22:44:42   (   0.09,-134.64) (  -0.90,-139.01)  498.39                80
 06/27/2015   22:25:56   (   0.08,-134.68) (   0.10,-134.48)   22.19                80
 06/30/2015   10:28:59   (  -0.09,-134.79) (  -0.01,-135.24)   51.07                80
 07/01/2015   10:12:54   (  -0.08,-134.82) (  -1.01,-130.70)  468.81                80
 07/02/2015   22:32:10   (   0.11,-134.83) (  -0.13,-136.02)  134.46                80
 07/03/2015   22:16:05   (   0.10,-134.86) (   0.87,-131.49)  384.88                80