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) (   0.29,-136.01)  135.56                80
 04/15/2021   10:51:36   (  -0.03,-137.20) (   0.87,-141.28)  464.53                80
 04/16/2021   10:30:11   (  -0.03,-137.20) (  -0.13,-136.74)   51.75                80
 04/18/2021   22:33:22   (   0.03,-137.18) (  -0.04,-137.51)   37.29                80
 04/19/2021   22:17:16   (   0.03,-137.17) (   0.95,-132.97)  478.46                80
 04/21/2021   10:39:02   (  -0.02,-137.16) (   0.25,-138.23)  123.21                80
 04/22/2021   10:17:38   (  -0.02,-137.14) (  -0.80,-133.71)  392.18                80
 04/23/2021   22:39:33   (   0.01,-137.12) (  -0.41,-139.00)  214.12                80
 04/24/2021   22:23:28   (   0.01,-137.11) (   0.59,-134.46)  300.95                80
 04/26/2021   10:45:15   (  -0.01,-137.08) (   0.56,-139.73)  301.79                80