Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 6 9.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/10/2019   22:46:39   (  -0.01,-137.19) (  -0.79,-140.63)  392.91                80
 06/11/2019   22:30:34   (  -0.01,-137.19) (   0.21,-136.10)  123.48                80
 06/13/2019   10:52:23   (   0.00,-137.21) (   0.92,-141.38)  474.80                80
 06/14/2019   10:30:59   (   0.00,-137.20) (  -0.08,-136.85)   40.90                80
 06/16/2019   22:34:12   (   0.01,-137.16) (  -0.07,-137.63)   52.37                80
 06/17/2019   22:18:07   (   0.00,-137.15) (   0.93,-133.09)  463.23                80
 06/19/2019   10:39:56   (  -0.00,-137.17) (   0.26,-138.36)  136.03                80
 06/20/2019   10:18:31   (   0.00,-137.15) (  -0.75,-133.83)  379.12                80
 06/21/2019   22:40:27   (  -0.00,-137.11) (  -0.46,-139.13)  230.70                80
 06/22/2019   22:24:23   (  -0.01,-137.09) (   0.54,-134.59)  284.40                80