Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2019 3 18.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/19/2019   22:04:44   (  -0.03,-128.30) (  -0.32,-129.59)  147.50                80
 03/20/2019   21:43:18   (  -0.03,-128.29) (   0.68,-125.05)  368.02                80
 03/22/2019   10:05:05   (   0.03,-128.31) (   0.46,-130.33)  229.26                80
 03/23/2019   09:46:20   (   0.03,-128.30) (  -0.55,-125.79)  286.15                80
 03/24/2019   22:10:55   (  -0.03,-128.24) (  -0.65,-131.09)  324.50                80
 03/25/2019   21:49:30   (  -0.03,-128.23) (   0.35,-126.55)  190.57                80
 03/27/2019   10:11:16   (   0.03,-128.24) (   0.84,-131.82)  407.53                80
 03/28/2019   09:55:11   (   0.03,-128.22) (  -0.16,-127.28)  107.40                80
 03/30/2019   21:55:40   (  -0.04,-128.14) (  -0.03,-128.04)   10.85                80