Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/26/2021   22:42:55   (  -0.01,-137.19) (  -0.42,-139.12)  218.92                80
 06/27/2021   22:21:31   (  -0.01,-137.19) (   0.55,-134.58)  296.91                80
 06/29/2021   10:46:00   (   0.02,-137.19) (   0.62,-139.86)  303.79                80
 06/30/2021   10:24:37   (   0.02,-137.19) (  -0.41,-135.33)  211.88                80
 07/01/2021   22:46:34   (  -0.02,-137.17) (  -0.78,-140.64)  394.26                80
 07/02/2021   22:30:31   (  -0.01,-137.17) (   0.25,-136.11)  121.27                80
 07/04/2021   10:52:19   (   0.01,-137.17) (   0.98,-141.37)  480.23                80
 07/05/2021   10:30:55   (   0.00,-137.16) (  -0.06,-136.85)   34.65                80
 07/07/2021   22:34:09   (   0.01,-137.12) (  -0.10,-137.63)   58.63                80
 07/08/2021   22:18:06   (   0.01,-137.10) (   0.94,-133.11)  455.77                80