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,-137.18) (  -0.44,-139.13)  222.09                80
 06/22/2019   22:24:24   (   0.00,-137.18) (   0.56,-134.60)  294.29                80
 06/24/2019   10:46:12   (   0.00,-137.20) (   0.62,-139.87)  304.43                80
 06/25/2019   10:24:47   (   0.01,-137.20) (  -0.39,-135.33)  211.43                80
 06/26/2019   22:46:45   (  -0.00,-137.16) (  -0.77,-140.65)  396.82                80
 06/27/2019   22:30:40   (  -0.00,-137.15) (   0.23,-136.11)  118.74                80
 06/29/2019   10:52:28   (  -0.00,-137.16) (   0.95,-141.38)  481.03                80
 06/30/2019   10:31:04   (  -0.00,-137.15) (  -0.06,-136.85)   33.76                80
 07/02/2019   22:34:17   (   0.01,-137.08) (  -0.09,-137.63)   62.25                80
 07/03/2019   22:18:12   (   0.00,-137.06) (   0.91,-133.10)  452.08                80