Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 4 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 04/11/2018   22:14:58   (  -0.09,-135.17) (   0.39,-132.91)  257.71                80
 04/13/2018   10:36:46   (   0.09,-135.21) (   0.77,-138.18)  339.16                80
 04/14/2018   10:20:42   (   0.09,-135.24) (  -0.23,-133.65)  180.14                80
 04/15/2018   22:42:39   (  -0.09,-135.28) (  -0.92,-138.96)  419.45                80
 04/16/2018   22:21:15   (  -0.09,-135.30) (   0.09,-134.43)   99.30                80
 04/18/2018   10:43:03   (   0.09,-135.32) (   1.08,-139.70)  499.20                80
 04/19/2018   10:26:59   (   0.09,-135.34) (   0.07,-135.17)   19.09                80
 04/21/2018   22:27:31   (  -0.10,-135.39) (  -0.21,-135.95)   64.34                80
 04/22/2018   22:11:27   (  -0.10,-135.40) (   0.81,-131.42)  453.33                80
 04/24/2018   10:30:35   (   0.10,-135.40) (   0.36,-136.69)  146.84                80
 04/25/2018   10:14:31   (   0.10,-135.41) (  -0.65,-132.16)  370.72                80