Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/12/2018   10:39:16   (   0.05,-135.14) (   0.72,-138.15)  343.13                80
 03/13/2018   10:17:51   (   0.05,-135.11) (  -0.27,-133.62)  169.85                80
 03/14/2018   22:39:49   (  -0.05,-135.07) (  -0.91,-138.93)  439.17                80
 03/15/2018   22:23:44   (  -0.05,-135.04) (   0.08,-134.39)   73.57                80
 03/18/2018   10:26:48   (   0.05,-134.95) (   0.09,-135.13)   21.12                80
 03/19/2018   10:05:23   (   0.05,-134.91) (  -0.91,-130.60)  490.97                80
 03/20/2018   22:27:21   (  -0.05,-134.86) (  -0.27,-135.91)  119.52                80
 03/21/2018   22:11:16   (  -0.05,-134.82) (   0.73,-131.38)  392.16                80
 03/23/2018   10:33:04   (   0.06,-134.74) (   0.50,-136.64)  216.54                80
 03/24/2018   10:11:39   (   0.06,-134.69) (  -0.49,-132.10)  294.57                80