Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 8 30.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 08/30/2021   22:24:52   (  -0.05,-137.19) (   0.52,-134.67)  286.98                80
 09/01/2021   10:46:40   (   0.04,-137.17) (   0.65,-139.94)  315.81                80
 09/02/2021   10:25:16   (   0.04,-137.16) (  -0.34,-135.41)  199.12                80
 09/03/2021   22:47:13   (  -0.03,-137.14) (  -0.84,-140.72)  407.51                80
 09/04/2021   22:31:09   (  -0.02,-137.13) (   0.16,-136.18)  107.11                80
 09/06/2021   10:50:17   (   0.01,-137.10) (   1.02,-141.45)  496.85                80
 09/07/2021   10:34:13   (   0.01,-137.08) (  -0.04,-136.93)   17.66                80
 09/09/2021   22:34:45   (  -0.01,-137.03) (  -0.19,-137.69)   75.84                80
 09/10/2021   22:18:42   (  -0.02,-137.01) (   0.87,-133.17)  438.15                80
 09/12/2021   10:37:49   (   0.01,-136.97) (   0.37,-138.43)  167.15                80