Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/13/2021   10:45:47   (   0.00,-137.20) (   0.57,-139.82)  298.52                80
 06/14/2021   10:24:22   (   0.00,-137.20) (  -0.42,-135.29)  217.23                80
 06/15/2021   22:49:00   (  -0.01,-137.19) (  -0.76,-140.60)  388.55                80
 06/16/2021   22:27:35   (  -0.00,-137.18) (   0.23,-136.06)  126.98                80
 06/18/2021   10:52:05   (   0.01,-137.17) (   0.92,-141.34)  474.63                80
 06/19/2021   10:30:40   (   0.00,-137.16) (  -0.07,-136.81)   40.49                80
 06/21/2021   22:36:33   (   0.00,-137.13) (  -0.12,-137.58)   52.04                80
 06/22/2021   22:15:09   (   0.01,-137.11) (   0.93,-133.06)  462.30                80
 06/24/2021   10:36:58   (  -0.01,-137.08) (   0.27,-138.32)  141.35                80
 06/25/2021   10:20:53   (  -0.01,-137.06) (  -0.72,-133.79)  372.62                80