Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/11/2021   10:23:58   (  -0.03,-137.19) (  -0.45,-135.24)  222.10                80
 04/12/2021   22:45:54   (   0.03,-137.19) (  -0.71,-140.55)  382.68                80
 04/13/2021   22:29:49   (   0.03,-137.18) (   0.28,-136.01)  132.89                80
 04/15/2021   10:51:36   (  -0.03,-137.15) (   0.87,-141.28)  469.67                80
 04/16/2021   10:30:11   (  -0.03,-137.14) (  -0.12,-136.74)   45.32                80
 04/18/2021   22:33:22   (   0.03,-137.10) (  -0.05,-137.51)   46.43                80
 04/19/2021   22:17:16   (   0.02,-137.08) (   0.94,-132.97)  468.06                80
 04/21/2021   10:39:02   (  -0.02,-137.04) (   0.27,-138.23)  136.07                80
 04/22/2021   10:17:38   (  -0.02,-137.01) (  -0.78,-133.70)  378.01                80
 04/23/2021   22:39:33   (   0.01,-136.98) (  -0.44,-139.00)  229.77                80
 04/24/2021   22:23:28   (   0.01,-136.95) (   0.56,-134.46)  284.02                80