Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/09/2021   22:34:46   (  -0.04,-137.20) (  -0.14,-137.70)   56.58                80
 09/10/2021   22:18:42   (  -0.04,-137.20) (   0.86,-133.17)  459.58                80
 09/12/2021   10:37:50   (   0.04,-137.20) (   0.31,-138.44)  141.54                80
 09/13/2021   10:21:46   (   0.04,-137.19) (  -0.69,-133.91)  373.89                80
 09/14/2021   22:41:03   (  -0.03,-137.17) (  -0.49,-139.21)  232.89                80
 09/15/2021   22:24:59   (  -0.03,-137.16) (   0.51,-134.68)  282.09                80
 09/17/2021   10:44:07   (   0.02,-137.14) (   0.66,-139.95)  320.48                80
 09/18/2021   10:28:03   (   0.01,-137.13) (  -0.40,-135.43)  194.38                80
 09/19/2021   22:47:20   (  -0.01,-137.10) (  -0.83,-140.72)  412.85                80
 09/20/2021   22:31:15   (  -0.01,-137.09) (   0.17,-136.19)  102.11                80