Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 6 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/29/2021   10:46:00   (   0.02,-137.19) (   0.64,-139.85)  304.16                80
 06/30/2021   10:24:36   (   0.02,-137.18) (  -0.40,-135.33)  211.38                80
 07/01/2021   22:46:34   (  -0.03,-137.17) (  -0.80,-140.63)  394.49                80
 07/02/2021   22:27:50   (  -0.02,-137.16) (   0.24,-136.11)  120.90                80
 07/04/2021   10:52:18   (   0.02,-137.15) (   0.98,-141.37)  481.12                80
 07/05/2021   10:30:55   (   0.01,-137.14) (  -0.05,-136.85)   33.65                80
 07/07/2021   22:34:09   (   0.00,-137.10) (  -0.09,-137.63)   59.55                80
 07/08/2021   22:18:04   (   0.01,-137.09) (   0.89,-133.09)  454.68                80
 07/10/2021   10:39:54   (  -0.01,-137.06) (   0.27,-138.37)  149.05                80
 07/11/2021   10:18:29   (  -0.01,-137.04) (  -0.71,-133.84)  364.80                80