Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 21.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/23/2018   10:33:04   (   0.06,-134.75) (   0.48,-136.64)  215.15                80
 03/24/2018   10:11:39   (   0.06,-134.71) (  -0.51,-132.11)  296.25                80
 03/25/2018   22:33:37   (  -0.07,-134.64) (  -0.66,-137.41)  315.60                80
 03/26/2018   22:17:32   (  -0.07,-134.59) (   0.34,-132.88)  195.59                80
 03/28/2018   10:39:19   (   0.08,-134.51) (   0.89,-138.14)  413.48                80
 03/29/2018   10:17:55   (   0.07,-134.46) (  -0.12,-133.61)   97.42                80
 03/31/2018   22:23:47   (  -0.08,-134.34) (  -0.11,-134.37)    5.23                80
 04/03/2018   10:26:51   (   0.08,-134.21) (   0.27,-135.12)  103.33                80
 04/04/2018   10:05:26   (   0.08,-134.15) (  -0.73,-130.58)  407.01                80