Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 8 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/19/2018   10:37:13   (  -0.36,-135.00) (   0.38,-138.23)  368.01                80
 08/20/2018   10:21:10   (  -0.35,-134.97) (  -0.66,-133.71)  144.33                80
 08/21/2018   22:40:27   (   0.37,-134.93) (  -0.53,-139.01)  464.55                80
 08/22/2018   22:24:23   (   0.37,-134.89) (   0.46,-134.48)   47.66                80
 08/25/2018   10:24:47   (  -0.38,-134.77) (  -0.31,-135.22)   50.88                80
 08/26/2018   10:08:43   (  -0.37,-134.73) (  -1.29,-130.69)  460.81                80
 08/27/2018   22:28:00   (   0.39,-134.68) (   0.11,-135.99)  149.11                80
 08/28/2018   22:11:56   (   0.38,-134.64) (   1.10,-131.46)  362.49                80
 08/30/2018   10:31:04   (  -0.39,-134.54) (   0.10,-136.72)  248.43                80
 08/31/2018   10:15:00   (  -0.39,-134.49) (  -0.89,-132.19)  262.44                80