Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2020 9 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/11/2020   22:40:27   (  -0.05,-137.19) (  -0.45,-139.07)  213.05                80
 09/12/2020   22:24:23   (  -0.05,-137.19) (   0.55,-134.53)  303.39                80
 09/14/2020   10:43:31   (   0.04,-137.19) (   0.62,-139.80)  297.57                80
 09/15/2020   10:27:26   (   0.03,-137.19) (  -0.38,-135.27)  218.43                80
 09/16/2020   22:46:44   (  -0.03,-137.18) (  -0.77,-140.58)  386.78                80
 09/17/2020   22:30:39   (  -0.03,-137.18) (   0.23,-136.05)  129.11                80
 09/19/2020   10:49:48   (   0.03,-137.17) (   0.94,-141.32)  472.56                80
 09/20/2020   10:33:43   (   0.03,-137.16) (  -0.06,-136.78)   42.92                80
 09/22/2020   22:34:15   (  -0.03,-137.13) (  -0.14,-137.55)   48.46                80
 09/23/2020   22:18:10   (  -0.02,-137.11) (   0.87,-133.02)  466.35                80