Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/24/2018   10:11:39   (   0.06,-134.71) (  -0.51,-132.10)  296.40                80
 03/25/2018   22:33:37   (  -0.07,-134.64) (  -0.67,-137.41)  315.54                80
 03/26/2018   22:17:32   (  -0.07,-134.59) (   0.33,-132.88)  195.70                80
 03/28/2018   10:39:19   (   0.08,-134.52) (   0.89,-138.14)  413.08                80
 03/29/2018   10:17:55   (   0.08,-134.47) (  -0.11,-133.61)   97.88                80
 03/31/2018   22:21:08   (  -0.08,-134.35) (  -0.06,-134.39)    4.76                80
 04/03/2018   10:26:51   (   0.08,-134.21) (   0.28,-135.11)  102.58                80
 04/04/2018   10:05:26   (   0.08,-134.16) (  -0.72,-130.58)  407.81                80
 04/05/2018   22:27:22   (  -0.08,-134.08) (  -0.50,-135.88)  205.93                80
 04/06/2018   22:11:18   (  -0.08,-134.02) (   0.51,-131.35)  304.24                80