Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 3.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/04/2021   22:31:09   (  -0.04,-137.20) (   0.16,-136.18)  115.48                80
 09/06/2021   10:50:17   (   0.04,-137.19) (   1.02,-141.45)  486.46                80
 09/07/2021   10:34:13   (   0.03,-137.18) (  -0.04,-136.93)   29.18                80
 09/09/2021   22:34:46   (  -0.03,-137.16) (  -0.14,-137.70)   61.20                80
 09/10/2021   22:18:42   (  -0.04,-137.15) (   0.86,-133.17)  453.91                80
 09/12/2021   10:37:50   (   0.03,-137.13) (   0.32,-138.44)  149.48                80
 09/13/2021   10:21:46   (   0.03,-137.11) (  -0.68,-133.91)  364.91                80
 09/14/2021   22:41:03   (  -0.02,-137.08) (  -0.49,-139.21)  242.85                80
 09/15/2021   22:24:58   (  -0.02,-137.06) (   0.51,-134.68)  271.07                80
 09/17/2021   10:44:07   (   0.01,-137.02) (   0.67,-139.95)  333.76                80