Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 9 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/24/2019   10:18:45   (  -0.02,-137.20) (  -0.77,-133.78)  389.12                80
 09/25/2019   22:40:41   (   0.02,-137.19) (  -0.41,-139.08)  215.74                80
 09/26/2019   22:24:36   (   0.02,-137.19) (   0.62,-134.55)  300.10                80
 09/28/2019   10:43:44   (  -0.02,-137.17) (   0.58,-139.82)  301.70                80
 09/29/2019   10:27:39   (  -0.01,-137.16) (  -0.44,-135.29)  213.96                80
 09/30/2019   22:46:55   (   0.01,-137.15) (  -0.78,-140.58)  391.61                80
 10/01/2019   22:30:50   (  -0.01,-137.13) (   0.25,-136.05)  123.99                80
 10/03/2019   10:52:37   (   0.02,-137.11) (   0.96,-141.31)  478.56                80
 10/04/2019   10:31:13   (   0.01,-137.09) (  -0.07,-136.78)   36.13                80
 10/06/2019   22:34:24   (  -0.01,-137.05) (  -0.12,-137.54)   56.28                80