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,-137.20) (   0.52,-134.67)  288.43                80
 09/01/2021   10:46:40   (   0.04,-137.20) (   0.65,-139.94)  312.18                80
 09/02/2021   10:25:16   (   0.04,-137.20) (  -0.34,-135.41)  203.94                80
 09/03/2021   22:47:13   (  -0.03,-137.20) (  -0.84,-140.72)  401.25                80
 09/04/2021   22:31:10   (  -0.03,-137.20) (   0.22,-136.19)  114.53                80
 09/06/2021   10:50:18   (   0.01,-137.19) (   0.96,-141.46)  487.24                80
 09/07/2021   10:34:13   (   0.01,-137.18) (  -0.04,-136.93)   28.31                80
 09/09/2021   22:34:46   (  -0.02,-137.16) (  -0.13,-137.71)   62.35                80
 09/10/2021   22:18:42   (  -0.02,-137.15) (   0.87,-133.17)  452.74                80
 09/12/2021   10:37:50   (   0.02,-137.12) (   0.30,-138.44)  150.40                80
 09/13/2021   10:21:46   (   0.01,-137.10) (  -0.70,-133.91)  363.94                80