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

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2021   10:34:50   (  -0.01,-137.22) (  -0.06,-136.97)   27.58                80
 12/14/2021   22:35:18   (   0.01,-137.21) (  -0.12,-137.74)   59.95                80
 12/15/2021   22:19:13   (   0.00,-137.21) (   0.91,-133.21)  456.82                80
 12/17/2021   10:38:18   (  -0.00,-137.21) (   0.30,-138.46)  143.12                80
 12/18/2021   10:22:13   (   0.00,-137.20) (  -0.73,-133.93)  373.14                80
 12/19/2021   22:41:27   (  -0.00,-137.18) (  -0.47,-139.23)  232.94                80
 12/20/2021   22:25:22   (  -0.01,-137.17) (   0.56,-134.70)  282.87                80
 12/22/2021   10:44:27   (   0.01,-137.16) (   0.65,-139.95)  318.33                80
 12/23/2021   10:28:21   (   0.01,-137.15) (  -0.38,-135.42)  197.02                80
 12/24/2021   22:47:36   (  -0.01,-137.12) (  -0.82,-140.72)  410.24                80
 12/25/2021   22:31:30   (  -0.01,-137.10) (   0.22,-136.19)  104.88                80