Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 10 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/03/2018   22:34:22   (  -0.30,-135.62) (  -0.71,-137.42)  205.07                80
 10/04/2018   22:18:17   (  -0.31,-135.63) (   0.31,-132.90)  311.67                80
 10/06/2018   10:40:06   (   0.28,-135.66) (   0.83,-138.18)  286.64                80
 10/07/2018   10:18:40   (   0.29,-135.65) (  -0.14,-133.64)  229.43                80
 10/08/2018   22:40:36   (  -0.27,-135.62) (  -1.03,-138.95)  379.89                80
 10/09/2018   22:24:32   (  -0.28,-135.62) (  -0.00,-134.42)  136.63                80
 10/11/2018   10:43:40   (   0.26,-135.65) (   1.14,-139.70)  461.12                80
 10/12/2018   10:24:55   (   0.27,-135.64) (   0.17,-135.16)   54.49                80
 10/14/2018   22:28:06   (  -0.26,-135.58) (  -0.36,-135.94)   41.24                80
 10/15/2018   22:12:01   (  -0.27,-135.57) (   0.67,-131.41)  474.47                80
 10/17/2018   10:31:09   (   0.24,-135.60) (   0.47,-136.69)  124.23                80