Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/07/2018   10:32:59   (   0.03,-135.28) (   0.36,-136.64)  155.76                80
 03/08/2018   10:11:36   (   0.03,-135.26) (  -0.70,-132.12)  358.15                80
 03/09/2018   22:33:32   (  -0.03,-135.22) (  -0.55,-137.41)  250.38                80
 03/10/2018   22:17:28   (  -0.03,-135.20) (   0.51,-132.89)  263.29                80
 03/12/2018   10:39:16   (   0.04,-135.16) (   0.73,-138.15)  341.32                80
 03/13/2018   10:17:51   (   0.04,-135.13) (  -0.27,-133.62)  171.93                80
 03/14/2018   22:39:49   (  -0.05,-135.09) (  -0.91,-138.93)  437.73                80
 03/15/2018   22:23:44   (  -0.05,-135.06) (   0.08,-134.40)   75.29                80
 03/18/2018   10:26:48   (   0.05,-134.98) (   0.09,-135.13)   17.66                80
 03/19/2018   10:05:23   (   0.04,-134.95) (  -0.90,-130.60)  494.73                80