Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 9 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/21/2019   22:15:42   (   0.01,-137.21) (   0.94,-133.05)  474.37                80
 09/23/2019   10:40:09   (  -0.01,-137.20) (   0.26,-138.31)  126.75                80
 09/24/2019   10:18:45   (  -0.02,-137.20) (  -0.77,-133.78)  389.01                80
 09/25/2019   22:40:41   (   0.02,-137.19) (  -0.41,-139.08)  216.14                80
 09/26/2019   22:24:36   (   0.01,-137.18) (   0.62,-134.56)  299.73                80
 09/28/2019   10:43:44   (  -0.01,-137.17) (   0.58,-139.82)  302.07                80
 09/29/2019   10:27:39   (  -0.00,-137.15) (  -0.45,-135.29)  213.47                80
 09/30/2019   22:46:55   (  -0.00,-137.14) (  -0.78,-140.58)  392.44                80
 10/01/2019   22:30:50   (  -0.01,-137.12) (   0.26,-136.05)  122.89                80
 10/03/2019   10:49:57   (   0.02,-137.10) (   0.95,-141.31)  479.76                80
 10/04/2019   10:31:12   (   0.02,-137.08) (  -0.02,-136.77)   35.13                80