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)
 03/13/2018   10:17:51   (   0.05,-135.11) (  -0.28,-133.62)  169.80                80
 03/14/2018   22:39:49   (  -0.05,-135.07) (  -0.90,-138.93)  439.20                80
 03/15/2018   22:23:44   (  -0.05,-135.04) (   0.09,-134.40)   73.51                80
 03/18/2018   10:26:48   (   0.05,-134.95) (   0.08,-135.14)   21.31                80
 03/19/2018   10:05:24   (   0.05,-134.91) (  -0.92,-130.60)  490.83                80
 03/20/2018   22:27:21   (  -0.05,-134.86) (  -0.26,-135.91)  119.67                80
 03/21/2018   22:11:16   (  -0.05,-134.81) (   0.74,-131.38)  392.02                80
 03/23/2018   10:33:04   (   0.06,-134.74) (   0.49,-136.64)  216.74                80
 03/24/2018   10:11:39   (   0.06,-134.69) (  -0.50,-132.11)  294.34                80
 03/25/2018   22:33:37   (  -0.07,-134.62) (  -0.67,-137.41)  317.76                80
 03/26/2018   22:17:32   (  -0.07,-134.57) (   0.33,-132.88)  193.09                80