Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 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)
 12/09/2021   22:31:49   (   0.01,-137.20) (   0.20,-136.24)  109.62                80
 12/11/2021   10:50:55   (  -0.01,-137.21) (   0.96,-141.51)  489.48                80
 12/12/2021   10:34:50   (  -0.01,-137.21) (  -0.08,-136.98)   27.54                80
 12/14/2021   22:35:19   (   0.01,-137.21) (  -0.10,-137.74)   60.50                80
 12/15/2021   22:19:12   (   0.00,-137.20) (   0.88,-133.20)  456.12                80
 12/17/2021   10:38:18   (   0.00,-137.20) (   0.28,-138.47)  143.96                80
 12/18/2021   10:22:12   (   0.01,-137.19) (  -0.70,-133.92)  372.12                80
 12/19/2021   22:41:27   (  -0.01,-137.17) (  -0.44,-139.23)  234.26                80
 12/20/2021   22:25:21   (  -0.01,-137.16) (   0.53,-134.69)  281.34                80
 12/22/2021   10:44:27   (   0.01,-137.15) (   0.62,-139.96)  320.11                80
 12/23/2021   10:28:21   (   0.01,-137.13) (  -0.36,-135.42)  195.07                80