Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/06/2021   10:50:18   (   0.04,-137.19) (   0.98,-141.46)  486.26                80
 09/07/2021   10:34:13   (   0.04,-137.18) (  -0.02,-136.93)   29.31                80
 09/09/2021   22:34:46   (  -0.04,-137.16) (  -0.16,-137.70)   61.15                80
 09/10/2021   22:18:42   (  -0.04,-137.15) (   0.84,-133.16)  453.93                80
 09/12/2021   10:37:50   (   0.04,-137.12) (   0.33,-138.43)  149.42                80
 09/13/2021   10:21:45   (   0.04,-137.11) (  -0.66,-133.90)  364.94                80
 09/14/2021   22:41:03   (  -0.03,-137.08) (  -0.51,-139.21)  242.91                80
 09/15/2021   22:24:58   (  -0.03,-137.06) (   0.49,-134.68)  271.00                80
 09/17/2021   10:44:06   (   0.01,-137.02) (   0.68,-139.95)  333.78                80
 09/18/2021   10:28:02   (   0.01,-137.00) (  -0.32,-135.41)  180.01                80