Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/14/2021   22:35:19   (   0.01,-137.21) (  -0.10,-137.74)   60.49                80
 12/15/2021   22:19:12   (   0.01,-137.20) (   0.87,-133.20)  456.14                80
 12/17/2021   10:38:18   (  -0.00,-137.20) (   0.28,-138.47)  144.10                80
 12/18/2021   10:22:13   (   0.00,-137.19) (  -0.75,-133.94)  371.97                80
 12/19/2021   22:41:27   (  -0.00,-137.17) (  -0.45,-139.23)  234.32                80
 12/20/2021   22:25:21   (  -0.01,-137.16) (   0.52,-134.69)  281.34                80
 12/22/2021   10:44:27   (   0.01,-137.15) (   0.63,-139.96)  320.15                80
 12/23/2021   10:25:41   (   0.01,-137.13) (  -0.35,-135.41)  195.06                80
 12/24/2021   22:47:36   (  -0.01,-137.10) (  -0.79,-140.72)  412.47                80
 12/25/2021   22:31:29   (  -0.01,-137.08) (   0.18,-136.18)  102.49                80