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   22:31:50   (   0.01,-137.20) (   0.25,-136.25)  109.69                80
 12/11/2021   10:50:55   (  -0.01,-137.21) (   0.97,-141.50)  489.31                80
 12/12/2021   10:34:50   (  -0.01,-137.22) (  -0.06,-136.97)   27.75                80
 12/14/2021   22:35:18   (   0.01,-137.21) (  -0.11,-137.74)   60.10                80
 12/15/2021   22:19:13   (   0.00,-137.21) (   0.92,-133.21)  456.55                80
 12/17/2021   10:38:18   (   0.00,-137.21) (   0.29,-138.46)  143.43                80
 12/18/2021   10:22:13   (   0.01,-137.20) (  -0.74,-133.93)  372.71                80
 12/19/2021   22:41:27   (  -0.01,-137.18) (  -0.46,-139.23)  233.56                80
 12/20/2021   22:25:21   (  -0.01,-137.17) (   0.52,-134.69)  282.10                80
 12/22/2021   10:44:27   (   0.01,-137.15) (   0.64,-139.96)  319.28                80