Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 6 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/24/2019   10:46:12   (  -0.01,-137.20) (   0.60,-139.87)  304.81                80
 06/25/2019   10:24:48   (  -0.00,-137.19) (  -0.40,-135.34)  211.04                80
 06/26/2019   22:46:45   (   0.00,-137.16) (  -0.76,-140.65)  396.62                80
 06/27/2019   22:30:40   (   0.00,-137.16) (   0.25,-136.12)  118.92                80
 06/29/2019   10:52:29   (  -0.01,-137.16) (   0.93,-141.39)  481.44                80
 06/30/2019   10:31:04   (  -0.01,-137.15) (  -0.08,-136.85)   33.28                80
 07/02/2019   22:34:16   (   0.01,-137.08) (  -0.13,-137.62)   62.06                80
 07/03/2019   22:18:12   (   0.01,-137.06) (   0.88,-133.09)  452.27                80
 07/05/2019   10:40:00   (  -0.01,-137.05) (   0.30,-138.36)  149.64                80
 07/06/2019   10:18:35   (   0.00,-137.02) (  -0.71,-133.83)  364.21                80