Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NPP
TLE Epoch: 2019 9 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 09/10/2019   22:24:37   (   0.02,-137.19) (   0.60,-134.58)  297.32                80
 09/12/2019   10:46:25   (  -0.02,-137.19) (   0.60,-139.84)  303.07                80
 09/13/2019   10:25:00   (  -0.02,-137.18) (  -0.42,-135.31)  212.69                80
 09/14/2019   22:46:56   (   0.02,-137.16) (  -0.76,-140.61)  393.87                80
 09/15/2019   22:30:52   (   0.02,-137.15) (   0.26,-136.08)  121.63                80
 09/17/2019   10:52:39   (  -0.02,-137.14) (   0.94,-141.34)  479.63                80
 09/18/2019   10:31:15   (  -0.02,-137.12) (  -0.08,-136.81)   35.36                80
 09/20/2019   22:34:27   (   0.03,-137.07) (  -0.07,-137.59)   58.26                80
 09/21/2019   22:18:21   (   0.03,-137.05) (   0.90,-133.04)  455.99                80
 09/23/2019   10:40:09   (  -0.03,-137.02) (   0.25,-138.32)  147.32                80
 09/24/2019   10:18:44   (  -0.03,-137.00) (  -0.72,-133.78)  366.32                80