Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 6 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/21/2019   22:40:28   (   0.01,-137.19) (  -0.45,-139.13)  222.07                80
 06/22/2019   22:24:24   (   0.00,-137.18) (   0.61,-134.61)  294.32                80
 06/24/2019   10:46:13   (  -0.00,-137.20) (   0.57,-139.88)  304.55                80
 06/25/2019   10:24:48   (   0.00,-137.19) (  -0.43,-135.35)  211.31                80
 06/26/2019   22:46:44   (   0.00,-137.16) (  -0.78,-140.64)  396.81                80
 06/27/2019   22:30:40   (   0.00,-137.16) (   0.22,-136.11)  118.75                80
 06/29/2019   10:52:28   (  -0.01,-137.16) (   0.95,-141.38)  481.15                80
 06/30/2019   10:31:04   (  -0.01,-137.15) (  -0.05,-136.85)   33.71                80
 07/02/2019   22:34:17   (   0.01,-137.08) (  -0.10,-137.63)   62.18                80
 07/03/2019   22:18:12   (   0.01,-137.06) (   0.91,-133.10)  452.12                80
 07/05/2019   10:37:20   (  -0.01,-137.05) (   0.26,-138.37)  149.47                80