Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 8 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/20/2018   10:21:10   (  -0.35,-134.97) (  -0.66,-133.70)  144.19                80
 08/21/2018   22:40:27   (   0.37,-134.93) (  -0.53,-139.01)  464.99                80
 08/22/2018   22:24:22   (   0.37,-134.89) (   0.45,-134.47)   47.10                80
 08/25/2018   10:24:47   (  -0.38,-134.76) (  -0.30,-135.22)   51.61                80
 08/26/2018   10:08:43   (  -0.37,-134.72) (  -1.28,-130.68)  459.88                80
 08/27/2018   22:28:00   (   0.39,-134.67) (   0.10,-135.99)  150.35                80
 08/28/2018   22:11:56   (   0.38,-134.62) (   1.09,-131.45)  361.10                80
 08/30/2018   10:31:04   (  -0.39,-134.53) (   0.11,-136.72)  249.89                80
 08/31/2018   10:14:59   (  -0.39,-134.48) (  -0.87,-132.18)  260.86                80
 09/01/2018   22:34:17   (   0.40,-134.41) (  -0.30,-137.49)  351.19                80