Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 9 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/10/2018   10:24:45   (   0.38,-135.23) (   0.36,-135.08)   16.72                80
 09/12/2018   22:27:59   (  -0.38,-135.31) (  -0.48,-135.87)   63.78                80
 09/13/2018   22:11:54   (  -0.38,-135.34) (   0.51,-131.34)  456.40                80
 09/15/2018   10:33:44   (   0.37,-135.40) (   0.63,-136.61)  137.70                80
 09/16/2018   10:12:19   (   0.37,-135.43) (  -0.36,-132.08)  381.40                80
 09/17/2018   22:34:16   (  -0.36,-135.45) (  -0.80,-137.39)  221.07                80
 09/18/2018   22:18:13   (  -0.36,-135.48) (   0.25,-132.87)  298.35                80
 09/20/2018   10:40:01   (   0.35,-135.54) (   0.95,-138.13)  295.88                80
 09/21/2018   10:18:38   (   0.35,-135.56) (  -0.10,-133.61)  222.66                80
 09/22/2018   22:40:34   (  -0.33,-135.56) (  -1.12,-138.91)  381.89                80
 09/23/2018   22:24:31   (  -0.34,-135.59) (  -0.06,-134.39)  137.04                80