Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2020 9 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/19/2020   10:49:47   (   0.04,-137.19) (   0.99,-141.30)  469.47                80
 09/20/2020   10:33:43   (   0.05,-137.19) (  -0.07,-136.78)   46.55                80
 09/22/2020   22:34:15   (  -0.04,-137.16) (  -0.13,-137.55)   44.12                80
 09/23/2020   22:18:11   (  -0.04,-137.15) (   0.88,-133.02)  471.08                80
 09/25/2020   10:37:19   (   0.03,-137.14) (   0.30,-138.29)  131.32                80
 09/26/2020   10:21:14   (   0.03,-137.12) (  -0.71,-133.75)  383.55                80
 09/27/2020   22:40:31   (  -0.02,-137.10) (  -0.49,-139.05)  223.72                80
 09/28/2020   22:24:27   (  -0.02,-137.08) (   0.58,-134.53)  291.15                80
 09/30/2020   10:43:35   (   0.02,-137.06) (   0.66,-139.79)  311.64                80
 10/01/2020   10:27:31   (   0.02,-137.05) (  -0.41,-135.27)  203.10                80