Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 12 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/22/2019   10:52:01   (   0.02,-137.21) (   0.93,-141.32)  468.03                80
 12/23/2019   10:30:36   (   0.02,-137.21) (  -0.07,-136.78)   47.96                80
 12/25/2019   22:36:25   (  -0.02,-137.19) (  -0.12,-137.55)   41.57                80
 12/26/2019   22:15:00   (  -0.02,-137.18) (   0.89,-133.01)  473.93                80
 12/28/2019   10:39:27   (   0.03,-137.16) (   0.25,-138.29)  128.17                80
 12/29/2019   10:18:02   (   0.02,-137.15) (  -0.76,-133.75)  387.04                80
 12/30/2019   22:42:37   (  -0.03,-137.13) (  -0.43,-139.05)  219.01                80
 12/31/2019   22:21:12   (  -0.02,-137.11) (   0.58,-134.52)  296.05                80
 01/02/2020   10:45:38   (   0.03,-137.09) (   0.62,-139.78)  306.52                80
 01/03/2020   10:24:12   (   0.02,-137.07) (  -0.39,-135.25)  208.20                80