Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 4 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/21/2019   10:45:40   (  -0.00,-137.20) (   0.61,-139.78)  294.38                80
 04/22/2019   10:24:17   (  -0.00,-137.20) (  -0.44,-135.26)  220.97                80
 04/23/2019   22:46:14   (   0.00,-137.17) (  -0.75,-140.57)  387.02                80
 04/24/2019   22:30:09   (   0.01,-137.16) (   0.25,-136.03)  128.43                80
 04/26/2019   10:51:58   (  -0.01,-137.17) (   0.94,-141.30)  471.55                80
 04/27/2019   10:30:34   (  -0.01,-137.16) (  -0.12,-136.78)   43.21                80
 04/29/2019   22:33:46   (   0.01,-137.10) (  -0.11,-137.55)   51.34                80
 04/30/2019   22:17:43   (   0.02,-137.09) (   0.95,-133.03)  463.70                80
 05/02/2019   10:39:31   (  -0.02,-137.09) (   0.23,-138.30)  136.82                80
 05/03/2019   10:18:06   (  -0.02,-137.07) (  -0.78,-133.77)  377.29                80