Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2020 9 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/22/2020   22:34:15   (  -0.04,-137.20) (  -0.11,-137.55)   39.63                80
 09/23/2020   22:18:11   (  -0.04,-137.20) (   0.90,-133.02)  476.93                80
 09/25/2020   10:37:19   (   0.04,-137.21) (   0.27,-138.29)  122.73                80
 09/26/2020   10:21:15   (   0.03,-137.21) (  -0.73,-133.76)  393.50                80
 09/27/2020   22:40:32   (  -0.02,-137.20) (  -0.41,-139.07)  212.34                80
 09/28/2020   22:24:28   (  -0.02,-137.20) (   0.60,-134.54)  303.86                80
 09/30/2020   10:43:36   (   0.02,-137.20) (   0.58,-139.81)  296.23                80
 10/01/2020   10:27:31   (   0.02,-137.20) (  -0.43,-135.28)  219.85                80
 10/02/2020   22:46:48   (  -0.02,-137.18) (  -0.76,-140.58)  386.31                80
 10/03/2020   22:30:43   (  -0.02,-137.18) (   0.25,-136.04)  129.45                80
 10/05/2020   10:49:52   (   0.02,-137.17) (   0.93,-141.31)  471.61                80