Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/25/2018   22:33:36   (  -0.07,-134.64) (  -0.71,-137.40)  315.55                80
 03/26/2018   22:17:31   (  -0.07,-134.59) (   0.29,-132.87)  195.72                80
 03/28/2018   10:39:20   (   0.08,-134.52) (   0.88,-138.14)  413.09                80
 03/29/2018   10:17:55   (   0.08,-134.47) (  -0.13,-133.61)   97.89                80
 03/31/2018   22:21:07   (  -0.08,-134.35) (  -0.10,-134.38)    4.39                80
 04/03/2018   10:26:51   (   0.08,-134.21) (   0.27,-135.12)  102.47                80
 04/04/2018   10:05:26   (   0.08,-134.16) (  -0.74,-130.58)  407.95                80
 04/05/2018   22:27:23   (  -0.08,-134.08) (  -0.48,-135.88)  205.75                80
 04/06/2018   22:11:18   (  -0.08,-134.02) (   0.52,-131.35)  304.44                80
 04/08/2018   10:30:25   (   0.09,-133.93) (   0.70,-136.61)  305.94                80