Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/08/2017   22:40:36   (   0.02,-135.35) (  -0.81,-139.10)  426.53                80
 12/09/2017   22:24:31   (   0.01,-135.36) (   0.17,-134.56)   90.99                80
 12/11/2017   10:43:39   (  -0.03,-135.46) (   0.95,-139.84)  499.70                80
 12/12/2017   10:27:34   (  -0.02,-135.46) (  -0.03,-135.30)   17.76                80
 12/14/2017   22:28:04   (   0.02,-135.39) (  -0.15,-136.08)   78.38                80
 12/15/2017   22:12:00   (   0.01,-135.39) (   0.89,-131.55)  438.54                80
 12/17/2017   10:31:07   (  -0.02,-135.48) (   0.30,-136.82)  153.33                80
 12/18/2017   10:15:03   (  -0.01,-135.48) (  -0.74,-132.29)  363.17                80
 12/19/2017   22:34:18   (   0.03,-135.39) (  -0.48,-137.59)  251.19                80
 12/20/2017   22:18:14   (   0.02,-135.38) (   0.56,-133.06)  264.87                80