Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 9 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/12/2018   22:27:59   (  -0.38,-135.30) (  -0.49,-135.87)   64.27                80
 09/13/2018   22:11:54   (  -0.38,-135.33) (   0.51,-131.33)  455.71                80
 09/15/2018   10:33:44   (   0.37,-135.40) (   0.63,-136.61)  138.30                80
 09/16/2018   10:12:19   (   0.37,-135.42) (  -0.36,-132.08)  380.62                80
 09/17/2018   22:34:16   (  -0.36,-135.44) (  -0.80,-137.39)  222.47                80
 09/18/2018   22:18:13   (  -0.36,-135.46) (   0.25,-132.87)  296.78                80
 09/20/2018   10:40:01   (   0.35,-135.53) (   0.95,-138.13)  297.34                80
 09/21/2018   10:18:38   (   0.35,-135.54) (  -0.11,-133.61)  221.03                80
 09/22/2018   22:40:34   (  -0.33,-135.54) (  -1.11,-138.91)  384.12                80
 09/23/2018   22:24:31   (  -0.34,-135.56) (  -0.05,-134.39)  134.66                80
 09/25/2018   10:46:19   (   0.32,-135.63) (   1.25,-139.65)  459.27                80
 09/26/2018   10:24:55   (   0.33,-135.64) (   0.20,-135.13)   58.66                80