Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/12/2021   10:37:50   (   0.05,-137.20) (   0.30,-138.44)  140.78                80
 09/13/2021   10:21:46   (   0.05,-137.19) (  -0.70,-133.91)  374.82                80
 09/14/2021   22:41:03   (  -0.04,-137.17) (  -0.48,-139.21)  232.00                80
 09/15/2021   22:24:59   (  -0.04,-137.16) (   0.52,-134.68)  283.16                80
 09/17/2021   10:44:07   (   0.03,-137.15) (   0.65,-139.95)  318.84                80
 09/18/2021   10:28:03   (   0.02,-137.14) (  -0.35,-135.42)  196.17                80
 09/19/2021   22:47:20   (  -0.01,-137.12) (  -0.81,-140.73)  411.11                80
 09/20/2021   22:31:15   (  -0.01,-137.11) (   0.19,-136.19)  103.99                80
 09/22/2021   10:50:24   (   0.01,-137.09) (   0.98,-141.46)  498.02                80
 09/23/2021   10:34:19   (   0.02,-137.08) (  -0.02,-136.93)   16.81                80