Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 12.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/13/2018   10:36:47   (   0.09,-135.21) (   0.75,-138.19)  339.01                80
 04/14/2018   10:20:42   (   0.09,-135.24) (  -0.26,-133.66)  180.38                80
 04/15/2018   22:42:40   (  -0.09,-135.30) (  -0.90,-138.97)  418.06                80
 04/16/2018   22:21:15   (  -0.09,-135.32) (   0.11,-134.44)  100.80                80
 04/18/2018   10:43:03   (   0.09,-135.33) (   1.06,-139.71)  498.45                80
 04/19/2018   10:26:59   (   0.09,-135.35) (   0.05,-135.18)   19.89                80
 04/21/2018   22:27:32   (  -0.10,-135.40) (  -0.19,-135.96)   62.34                80
 04/22/2018   22:11:27   (  -0.10,-135.42) (   0.82,-131.43)  455.51                80
 04/24/2018   10:30:35   (   0.10,-135.42) (   0.41,-136.68)  145.41                80
 04/25/2018   10:14:30   (   0.10,-135.43) (  -0.60,-132.15)  372.26                80