Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 5 15.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 05/15/2019   22:33:57   (  -0.00,-137.19) (  -0.08,-137.59)   45.39                80
 05/16/2019   22:17:53   (  -0.00,-137.18) (   0.91,-133.05)  470.78                80
 05/18/2019   10:39:42   (   0.00,-137.20) (   0.23,-138.33)  127.95                80
 05/19/2019   10:18:18   (   0.00,-137.20) (  -0.76,-133.80)  387.47                80
 05/20/2019   22:40:15   (   0.00,-137.16) (  -0.41,-139.11)  221.56                80
 05/21/2019   22:24:10   (   0.00,-137.15) (   0.58,-134.57)  293.78                80
 05/23/2019   10:45:59   (  -0.01,-137.17) (   0.61,-139.84)  305.54                80
 05/24/2019   10:24:35   (  -0.01,-137.15) (  -0.44,-135.32)  209.18                80
 05/25/2019   22:46:32   (   0.02,-137.10) (  -0.78,-140.62)  401.25                80
 05/26/2019   22:30:28   (   0.02,-137.09) (   0.27,-136.10)  113.68                80
 05/28/2019   10:52:16   (  -0.02,-137.10) (   0.93,-141.36)  485.78                80
 05/29/2019   10:30:52   (  -0.02,-137.08) (  -0.06,-136.83)   28.53                80