Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 3 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 03/21/2018   22:11:16   (  -0.06,-134.82) (   0.70,-131.37)  393.00                80
 03/23/2018   10:33:04   (   0.06,-134.75) (   0.46,-136.64)  215.28                80
 03/24/2018   10:11:40   (   0.06,-134.70) (  -0.54,-132.11)  296.10                80
 03/25/2018   22:33:36   (  -0.07,-134.64) (  -0.70,-137.41)  315.74                80
 03/26/2018   22:17:32   (  -0.07,-134.59) (   0.30,-132.87)  195.38                80
 03/28/2018   10:39:20   (   0.08,-134.51) (   0.86,-138.15)  413.81                80
 03/29/2018   10:17:55   (   0.07,-134.46) (  -0.14,-133.61)   97.10                80
 03/31/2018   22:21:07   (  -0.08,-134.34) (  -0.09,-134.38)    4.67                80
 04/03/2018   10:26:50   (   0.08,-134.20) (   0.31,-135.11)  103.92                80