Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/13/2021   22:27:09   (   0.04,-137.20) (   0.31,-136.01)  135.55                80
 04/15/2021   10:51:36   (  -0.03,-137.20) (   0.90,-141.27)  464.52                80
 04/16/2021   10:30:11   (  -0.03,-137.20) (  -0.15,-136.75)   51.77                80
 04/18/2021   22:33:22   (   0.03,-137.18) (  -0.02,-137.51)   37.40                80
 04/19/2021   22:17:16   (   0.03,-137.17) (   0.98,-132.98)  478.48                80
 04/21/2021   10:39:03   (  -0.02,-137.16) (   0.23,-138.23)  123.14                80
 04/22/2021   10:17:37   (  -0.02,-137.14) (  -0.76,-133.70)  392.22                80
 04/23/2021   22:39:34   (   0.01,-137.12) (  -0.39,-139.00)  214.10                80
 04/24/2021   22:23:28   (   0.01,-137.11) (   0.61,-134.47)  300.98                80
 04/26/2021   10:45:14   (  -0.01,-137.08) (   0.60,-139.73)  301.73                80
 04/27/2021   10:23:50   (  -0.01,-137.06) (  -0.46,-135.20)  212.80                80