Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 9 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/20/2019   22:37:06   (   0.00,-137.21) (  -0.09,-137.58)   42.07                80
 09/21/2019   22:15:42   (   0.00,-137.21) (   0.94,-133.05)  474.25                80
 09/23/2019   10:40:09   (  -0.01,-137.20) (   0.26,-138.31)  126.97                80
 09/24/2019   10:18:45   (  -0.02,-137.19) (  -0.76,-133.78)  388.61                80
 09/25/2019   22:40:41   (   0.02,-137.18) (  -0.41,-139.08)  216.77                80
 09/26/2019   22:24:36   (   0.01,-137.17) (   0.62,-134.56)  298.99                80
 09/28/2019   10:43:44   (  -0.01,-137.16) (   0.58,-139.82)  302.87                80
 09/29/2019   10:27:39   (  -0.00,-137.15) (  -0.45,-135.29)  212.56                80
 09/30/2019   22:46:55   (  -0.00,-137.13) (  -0.78,-140.58)  393.67                80
 10/01/2019   22:30:50   (  -0.01,-137.11) (   0.26,-136.05)  121.54                80
 10/03/2019   10:49:57   (   0.01,-137.09) (   0.95,-141.31)  481.18                80
 10/04/2019   10:33:52   (   0.02,-137.07) (  -0.03,-136.77)   33.58                80