Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 13.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/14/2018   22:39:49   (  -0.05,-135.07) (  -0.89,-138.93)  439.16                80
 03/15/2018   22:23:44   (  -0.05,-135.04) (   0.11,-134.40)   73.58                80
 03/18/2018   10:26:48   (   0.05,-134.95) (   0.07,-135.14)   21.41                80
 03/19/2018   10:05:24   (   0.05,-134.91) (  -0.93,-130.61)  490.91                80
 03/20/2018   22:27:20   (  -0.05,-134.86) (  -0.31,-135.90)  119.57                80
 03/21/2018   22:11:17   (  -0.05,-134.82) (   0.75,-131.38)  392.14                80
 03/23/2018   10:33:04   (   0.06,-134.74) (   0.48,-136.64)  216.64                80
 03/24/2018   10:11:39   (   0.06,-134.69) (  -0.51,-132.11)  294.44                80
 03/25/2018   22:33:37   (  -0.07,-134.62) (  -0.66,-137.42)  317.63                80
 03/26/2018   22:17:32   (  -0.07,-134.57) (   0.34,-132.88)  193.24                80