Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2020 12 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)
 12/19/2020   10:42:53   (  -0.01,-137.23) (   0.53,-139.79)  290.79                80
 12/20/2020   10:26:49   (  -0.01,-137.23) (  -0.48,-135.26)  225.27                80
 12/21/2020   22:46:05   (   0.01,-137.22) (  -0.75,-140.56)  380.79                80
 12/22/2020   22:30:01   (   0.01,-137.21) (   0.26,-136.03)  135.11                80
 12/24/2020   10:49:09   (  -0.01,-137.21) (   0.89,-141.30)  465.95                80
 12/25/2020   10:33:05   (  -0.00,-137.20) (  -0.12,-136.77)   49.63                80
 12/27/2020   22:33:36   (  -0.01,-137.17) (  -0.09,-137.54)   42.29                80
 12/28/2020   22:17:32   (  -0.01,-137.16) (   0.92,-133.01)  472.50                80
 12/30/2020   10:36:39   (   0.01,-137.14) (   0.29,-138.28)  130.48                80
 12/31/2020   10:20:35   (   0.01,-137.12) (  -0.72,-133.75)  383.75                80