Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2021 12 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/11/2021   10:50:56   (  -0.02,-137.21) (   0.94,-141.51)  490.06                80
 12/12/2021   10:34:50   (  -0.01,-137.21) (  -0.09,-136.98)   27.04                80
 12/14/2021   22:35:19   (   0.01,-137.20) (  -0.08,-137.74)   60.93                80
 12/15/2021   22:19:12   (   0.00,-137.20) (   0.89,-133.20)  455.69                80
 12/17/2021   10:38:19   (  -0.00,-137.19) (   0.26,-138.47)  144.88                80
 12/18/2021   10:22:12   (   0.00,-137.19) (  -0.71,-133.93)  371.18                80
 12/19/2021   22:41:27   (  -0.00,-137.17) (  -0.49,-139.22)  234.89                80
 12/20/2021   22:25:21   (  -0.01,-137.15) (   0.54,-134.69)  280.71                80
 12/22/2021   10:44:26   (   0.01,-137.14) (   0.67,-139.95)  321.16                80
 12/23/2021   10:28:21   (   0.01,-137.12) (  -0.37,-135.42)  194.01                80
 12/24/2021   22:47:35   (  -0.01,-137.09) (  -0.83,-140.72)  413.18                80