Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/20/2021   22:25:22   (   0.01,-137.20) (   0.59,-134.70)  285.02                80
 12/22/2021   10:44:27   (  -0.01,-137.19) (   0.62,-139.96)  315.21                80
 12/23/2021   10:28:22   (  -0.01,-137.19) (  -0.42,-135.43)  200.93                80
 12/24/2021   22:47:36   (   0.01,-137.17) (  -0.78,-140.72)  405.15                80
 12/25/2021   22:31:30   (   0.01,-137.16) (   0.25,-136.19)  110.82                80
 12/27/2021   10:50:36   (  -0.01,-137.15) (   0.95,-141.45)  490.14                80
 12/28/2021   10:31:49   (  -0.01,-137.14) (  -0.03,-136.91)   25.52                80
 12/30/2021   22:34:58   (  -0.00,-137.09) (  -0.12,-137.67)   66.95                80
 12/31/2021   22:18:52   (  -0.01,-137.06) (   0.86,-133.13)  447.85                80
 01/02/2022   10:40:37   (   0.01,-137.04) (   0.34,-138.39)  154.98                80