Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 14.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/15/2018   22:23:44   (  -0.05,-135.04) (   0.08,-134.39)   73.59                80
 03/18/2018   10:26:48   (   0.05,-134.95) (   0.09,-135.13)   21.08                80
 03/19/2018   10:05:23   (   0.05,-134.91) (  -0.91,-130.60)  491.04                80
 03/20/2018   22:27:21   (  -0.05,-134.86) (  -0.27,-135.91)  119.45                80
 03/21/2018   22:11:16   (  -0.05,-134.82) (   0.72,-131.38)  392.24                80
 03/23/2018   10:33:04   (   0.06,-134.74) (   0.50,-136.64)  216.47                80
 03/24/2018   10:11:39   (   0.06,-134.69) (  -0.49,-132.10)  294.66                80
 03/25/2018   22:33:36   (  -0.07,-134.62) (  -0.68,-137.41)  317.43                80
 03/26/2018   22:17:32   (  -0.07,-134.57) (   0.32,-132.88)  193.43                80
 03/28/2018   10:39:19   (   0.07,-134.49) (   0.91,-138.14)  416.22                80