Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/06/2021   10:44:46   (  -0.00,-137.19) (   0.63,-140.01)  321.31                80
 12/07/2021   10:28:40   (   0.00,-137.18) (  -0.39,-135.48)  194.78                80
 12/08/2021   22:47:55   (   0.00,-137.17) (  -0.81,-140.77)  410.83                80
 12/09/2021   22:31:49   (   0.00,-137.16) (   0.21,-136.24)  105.17                80
 12/11/2021   10:50:55   (  -0.01,-137.15) (   0.94,-141.51)  495.97                80
 12/12/2021   10:34:49   (  -0.00,-137.14) (  -0.03,-136.97)   20.02                80
 12/14/2021   22:35:18   (   0.00,-137.12) (  -0.15,-137.73)   70.31                80
 12/15/2021   22:19:12   (  -0.00,-137.10) (   0.89,-133.20)  445.19                80
 12/17/2021   10:38:18   (   0.01,-137.08) (   0.33,-138.46)  157.01                80
 12/18/2021   10:22:12   (   0.01,-137.06) (  -0.70,-133.93)  357.94                80
 12/19/2021   22:41:26   (  -0.01,-137.03) (  -0.50,-139.22)  249.67                80