Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 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)
 03/18/2018   10:26:48   (   0.05,-134.95) (   0.08,-135.13)   21.26                80
 03/19/2018   10:05:24   (   0.05,-134.91) (  -0.92,-130.60)  490.98                80
 03/20/2018   22:27:21   (  -0.06,-134.86) (  -0.27,-135.91)  119.18                80
 03/21/2018   22:11:16   (  -0.05,-134.82) (   0.73,-131.38)  392.60                80
 03/23/2018   10:33:04   (   0.06,-134.74) (   0.50,-136.64)  216.25                80
 03/24/2018   10:11:39   (   0.06,-134.70) (  -0.50,-132.10)  294.94                80
 03/25/2018   22:33:36   (  -0.07,-134.63) (  -0.68,-137.41)  316.82                80
 03/26/2018   22:17:32   (  -0.07,-134.58) (   0.33,-132.88)  194.12                80
 03/28/2018   10:39:19   (   0.07,-134.50) (   0.90,-138.14)  415.66                80
 03/29/2018   10:17:55   (   0.07,-134.44) (  -0.10,-133.61)   95.04                80
 03/31/2018   22:21:08   (  -0.07,-134.32) (  -0.07,-134.38)    7.05                80