Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 9 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/20/2019   22:34:27   (   0.02,-137.21) (  -0.06,-137.59)   43.07                80
 09/21/2019   22:18:22   (   0.02,-137.20) (   0.97,-133.06)  473.15                80
 09/23/2019   10:40:10   (  -0.02,-137.20) (   0.23,-138.32)  127.72                80
 09/24/2019   10:18:45   (  -0.02,-137.19) (  -0.79,-133.79)  387.89                80
 09/25/2019   22:40:41   (   0.02,-137.17) (  -0.38,-139.09)  218.15                80
 09/26/2019   22:24:36   (   0.03,-137.16) (   0.59,-134.55)  297.30                80
 09/28/2019   10:46:24   (  -0.03,-137.15) (   0.56,-139.82)  304.49                80
 09/29/2019   10:24:59   (  -0.03,-137.14) (  -0.41,-135.28)  210.71                80
 09/30/2019   22:46:55   (   0.02,-137.11) (  -0.75,-140.59)  396.14                80
 10/01/2019   22:30:51   (   0.02,-137.09) (   0.28,-136.06)  118.91                80