Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 9 6.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/06/2021   10:50:18   (   0.04,-137.19) (   0.98,-141.46)  485.91                80
 09/07/2021   10:34:13   (   0.04,-137.18) (  -0.02,-136.92)   29.78                80
 09/09/2021   22:34:46   (  -0.04,-137.17) (  -0.17,-137.70)   60.45                80
 09/10/2021   22:18:41   (  -0.04,-137.16) (   0.83,-133.16)  454.76                80
 09/12/2021   10:37:50   (   0.04,-137.13) (   0.34,-138.43)  148.29                80
 09/13/2021   10:21:45   (   0.04,-137.12) (  -0.66,-133.90)  366.20                80
 09/14/2021   22:41:03   (  -0.03,-137.09) (  -0.51,-139.21)  241.55                80
 09/15/2021   22:24:58   (  -0.03,-137.07) (   0.49,-134.67)  272.49                80
 09/17/2021   10:44:06   (   0.02,-137.04) (   0.69,-139.94)  332.00                80
 09/18/2021   10:28:03   (   0.01,-137.01) (  -0.37,-135.42)  181.92                80
 09/19/2021   22:47:19   (  -0.01,-136.98) (  -0.85,-140.72)  426.28                80