Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 6 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)
 06/19/2019   10:39:55   (  -0.01,-137.21) (   0.26,-138.36)  131.50                80
 06/20/2019   10:18:31   (  -0.00,-137.20) (  -0.74,-133.82)  384.42                80
 06/21/2019   22:40:28   (  -0.00,-137.17) (  -0.42,-139.14)  223.43                80
 06/22/2019   22:24:24   (  -0.01,-137.16) (   0.58,-134.60)  292.46                80
 06/24/2019   10:46:12   (   0.01,-137.18) (   0.60,-139.87)  306.73                80
 06/25/2019   10:24:48   (   0.02,-137.17) (  -0.40,-135.34)  208.59                80
 06/26/2019   22:46:44   (  -0.01,-137.12) (  -0.81,-140.64)  400.76                80
 06/27/2019   22:30:39   (  -0.02,-137.11) (   0.19,-136.10)  114.31                80
 06/29/2019   10:52:28   (   0.01,-137.12) (   0.99,-141.37)  485.96                80
 06/30/2019   10:33:44   (   0.01,-137.10) (  -0.07,-136.86)   28.41                80