Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/01/2021   10:46:40   (   0.05,-137.20) (   0.67,-139.94)  311.66                80
 09/02/2021   10:25:16   (   0.05,-137.21) (  -0.33,-135.41)  204.63                80
 09/03/2021   22:47:13   (  -0.04,-137.21) (  -0.85,-140.71)  400.19                80
 09/04/2021   22:31:09   (  -0.04,-137.20) (   0.20,-136.19)  115.80                80
 09/06/2021   10:50:18   (   0.03,-137.20) (   0.97,-141.46)  485.70                80
 09/07/2021   10:34:13   (   0.03,-137.19) (  -0.03,-136.93)   30.00                80
 09/09/2021   22:34:46   (  -0.03,-137.17) (  -0.15,-137.70)   60.26                80
 09/10/2021   22:18:42   (  -0.03,-137.16) (   0.85,-133.17)  454.98                80
 09/12/2021   10:37:50   (   0.03,-137.14) (   0.33,-138.44)  147.98                80
 09/13/2021   10:21:45   (   0.03,-137.12) (  -0.67,-133.90)  366.54                80
 09/14/2021   22:41:03   (  -0.02,-137.10) (  -0.50,-139.21)  241.30                80