Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 5 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)
 05/09/2019   22:46:23   (  -0.00,-137.17) (  -0.78,-140.59)  390.02                80
 05/10/2019   22:30:20   (  -0.00,-137.17) (   0.27,-136.07)  125.51                80
 05/12/2019   10:52:08   (   0.00,-137.18) (   0.93,-141.34)  473.90                80
 05/13/2019   10:30:44   (   0.00,-137.17) (  -0.06,-136.80)   41.05                80
 05/15/2019   22:33:57   (  -0.00,-137.11) (  -0.12,-137.58)   53.73                80
 05/16/2019   22:17:53   (  -0.00,-137.10) (   0.93,-133.06)  461.23                80
 05/18/2019   10:39:41   (  -0.00,-137.11) (   0.27,-138.32)  138.88                80
 05/19/2019   10:18:17   (  -0.01,-137.09) (  -0.72,-133.79)  375.27                80
 05/20/2019   22:40:14   (   0.01,-137.03) (  -0.45,-139.10)  236.07                80
 05/21/2019   22:24:10   (   0.02,-137.01) (   0.55,-134.57)  278.05                80
 05/23/2019   10:45:59   (  -0.02,-137.01) (   0.59,-139.85)  322.69                80