Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 7 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)
 07/19/2018   10:20:46   (  -0.19,-135.49) (  -0.62,-133.64)  211.64                80
 07/20/2018   22:40:05   (   0.22,-135.53) (  -0.53,-138.96)  390.37                80
 07/21/2018   22:24:00   (   0.21,-135.53) (   0.44,-134.42)  126.65                80
 07/23/2018   10:43:10   (  -0.24,-135.52) (   0.70,-139.70)  476.70                80
 07/24/2018   10:27:05   (  -0.23,-135.52) (  -0.28,-135.16)   39.93                80
 07/26/2018   22:27:40   (   0.24,-135.54) (   0.16,-135.95)   47.06                80
 07/27/2018   22:11:36   (   0.23,-135.54) (   1.14,-131.42)  469.13                80
 07/29/2018   10:30:45   (  -0.26,-135.51) (   0.00,-136.70)  135.27                80
 07/30/2018   10:14:40   (  -0.25,-135.50) (  -0.97,-132.16)  380.58                80
 07/31/2018   22:33:59   (   0.27,-135.52) (  -0.18,-137.48)  223.68                80
 08/01/2018   22:17:55   (   0.26,-135.51) (   0.86,-132.95)  291.98                80