Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/10/2021   22:18:41   (  -0.04,-137.20) (   0.83,-133.16)  459.72                80
 09/12/2021   10:37:50   (   0.04,-137.20) (   0.34,-138.43)  141.09                80
 09/13/2021   10:21:46   (   0.04,-137.19) (  -0.72,-133.91)  374.46                80
 09/14/2021   22:41:03   (  -0.03,-137.17) (  -0.51,-139.21)  232.38                80
 09/15/2021   22:24:59   (  -0.03,-137.16) (   0.55,-134.69)  282.71                80
 09/17/2021   10:44:07   (   0.02,-137.15) (   0.62,-139.96)  319.52                80
 09/18/2021   10:28:03   (   0.01,-137.14) (  -0.38,-135.42)  195.42                80
 09/19/2021   22:47:19   (  -0.01,-137.11) (  -0.85,-140.72)  411.85                80
 09/20/2021   22:31:16   (  -0.01,-137.10) (   0.22,-136.20)  103.24                80
 09/22/2021   10:50:23   (   0.01,-137.08) (   1.02,-141.46)  499.00                80
 09/23/2021   10:34:20   (   0.01,-137.07) (  -0.05,-136.94)   16.04                80