Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 10 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/20/2021   10:28:19   (   0.03,-137.19) (  -0.34,-135.42)  201.06                80
 10/21/2021   22:47:38   (  -0.03,-137.18) (  -0.80,-140.74)  405.25                80
 10/22/2021   22:31:34   (  -0.03,-137.18) (   0.19,-136.21)  109.98                80
 10/24/2021   10:50:45   (   0.03,-137.16) (   0.98,-141.49)  492.66                80
 10/25/2021   10:34:41   (   0.03,-137.15) (  -0.01,-136.96)   21.94                80
 10/27/2021   22:35:16   (  -0.02,-137.11) (  -0.18,-137.74)   71.81                80
 10/28/2021   22:19:14   (  -0.02,-137.10) (   0.87,-133.22)  442.29                80
 10/30/2021   10:38:23   (   0.01,-137.07) (   0.36,-138.48)  161.88                80
 10/31/2021   10:22:20   (   0.01,-137.05) (  -0.70,-133.97)  351.90                80
 11/01/2021   22:41:39   (  -0.01,-137.01) (  -0.49,-139.28)  257.19                80
 11/02/2021   22:25:35   (  -0.01,-136.99) (   0.51,-134.75)  256.34                80