Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 6 22.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 06/23/2018   10:08:16   (  -0.04,-134.93) (  -1.02,-130.61)  493.06                80
 06/24/2018   22:27:33   (   0.07,-135.00) (  -0.11,-135.92)  104.36                80
 06/25/2018   22:11:28   (   0.06,-135.04) (   0.87,-131.38)  416.48                80
 06/27/2018   10:30:36   (  -0.09,-135.08) (   0.26,-136.66)  179.78                80
 06/28/2018   10:14:32   (  -0.08,-135.11) (  -0.78,-132.13)  340.68                80
 06/29/2018   22:33:48   (   0.11,-135.17) (  -0.41,-137.43)  257.84                80
 06/30/2018   22:17:44   (   0.09,-135.20) (   0.63,-132.90)  262.37                80
 07/02/2018   10:36:51   (  -0.12,-135.24) (   0.55,-138.17)  334.74                80
 07/03/2018   10:20:46   (  -0.11,-135.26) (  -0.48,-133.64)  185.18                80
 07/04/2018   22:40:03   (   0.13,-135.31) (  -0.70,-138.94)  414.26                80
 07/05/2018   22:23:58   (   0.12,-135.34) (   0.34,-134.42)  105.35                80