Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 4 16.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/16/2021   10:30:11   (  -0.04,-137.20) (  -0.15,-136.75)   51.79                80
 04/18/2021   22:36:01   (   0.03,-137.18) (  -0.07,-137.50)   37.55                80
 04/19/2021   22:17:17   (   0.03,-137.17) (   0.98,-132.98)  478.30                80
 04/21/2021   10:39:03   (  -0.02,-137.16) (   0.23,-138.24)  123.23                80
 04/22/2021   10:17:37   (  -0.02,-137.14) (  -0.77,-133.70)  392.10                80
 04/23/2021   22:39:34   (   0.01,-137.12) (  -0.39,-139.00)  214.34                80
 04/24/2021   22:23:28   (   0.02,-137.11) (   0.61,-134.47)  300.70                80
 04/26/2021   10:45:15   (  -0.01,-137.08) (   0.60,-139.73)  301.93                80
 04/27/2021   10:23:50   (  -0.02,-137.06) (  -0.46,-135.20)  212.56                80
 04/28/2021   22:45:45   (   0.02,-137.02) (  -0.75,-140.50)  395.44                80
 04/29/2021   22:29:40   (   0.02,-137.00) (   0.25,-135.96)  118.57                80