Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2020 9 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)
 09/11/2020   22:40:27   (  -0.05,-137.19) (  -0.47,-139.06)  212.92                80
 09/12/2020   22:24:22   (  -0.05,-137.20) (   0.54,-134.53)  303.56                80
 09/14/2020   10:43:31   (   0.04,-137.19) (   0.63,-139.80)  297.41                80
 09/15/2020   10:27:26   (   0.03,-137.19) (  -0.37,-135.27)  218.67                80
 09/16/2020   22:46:44   (  -0.03,-137.19) (  -0.79,-140.58)  386.42                80
 09/17/2020   22:30:39   (  -0.03,-137.18) (   0.22,-136.04)  129.51                80
 09/19/2020   10:49:47   (   0.03,-137.17) (   0.95,-141.31)  472.16                80
 09/20/2020   10:33:43   (   0.03,-137.16) (  -0.05,-136.78)   43.36                80
 09/22/2020   22:34:15   (  -0.03,-137.13) (  -0.15,-137.55)   47.89                80
 09/23/2020   22:18:11   (  -0.03,-137.12) (   0.92,-133.03)  467.04                80
 09/25/2020   10:37:20   (   0.02,-137.10) (   0.26,-138.30)  136.44                80