Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 9.  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) (  -0.17,-137.69)   56.57                80
 09/10/2021   22:18:42   (  -0.04,-137.20) (   0.88,-133.17)  459.66                80
 09/12/2021   10:37:50   (   0.04,-137.20) (   0.35,-138.43)  141.30                80
 09/13/2021   10:21:46   (   0.04,-137.19) (  -0.71,-133.91)  374.22                80
 09/14/2021   22:41:03   (  -0.03,-137.17) (  -0.46,-139.22)  232.63                80
 09/15/2021   22:24:59   (  -0.03,-137.16) (   0.54,-134.68)  282.41                80
 09/17/2021   10:44:07   (   0.02,-137.14) (   0.64,-139.95)  319.95                80
 09/18/2021   10:28:03   (   0.01,-137.13) (  -0.36,-135.42)  194.94                80
 09/19/2021   22:47:20   (  -0.01,-137.11) (  -0.80,-140.73)  412.32                80
 09/20/2021   22:31:16   (  -0.01,-137.10) (   0.20,-136.20)  102.68                80
 09/22/2021   10:50:24   (   0.01,-137.08) (   0.97,-141.47)  499.67                80