Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 2.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/03/2021   22:47:13   (  -0.05,-137.20) (  -0.84,-140.71)  400.53                80
 09/04/2021   22:31:09   (  -0.04,-137.20) (   0.16,-136.18)  115.32                80
 09/06/2021   10:50:17   (   0.03,-137.19) (   1.02,-141.45)  486.68                80
 09/07/2021   10:34:13   (   0.03,-137.18) (  -0.04,-136.93)   28.91                80
 09/09/2021   22:34:46   (  -0.03,-137.16) (  -0.14,-137.70)   61.59                80
 09/10/2021   22:18:42   (  -0.03,-137.15) (   0.86,-133.17)  453.48                80
 09/12/2021   10:37:50   (   0.03,-137.12) (   0.32,-138.44)  149.95                80
 09/13/2021   10:21:46   (   0.03,-137.10) (  -0.68,-133.91)  364.39                80
 09/14/2021   22:41:03   (  -0.02,-137.08) (  -0.49,-139.21)  243.46                80
 09/15/2021   22:24:58   (  -0.02,-137.05) (   0.51,-134.68)  270.41                80