Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 5 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)
 05/23/2018   22:27:35   (  -0.06,-135.23) (  -0.20,-135.94)   81.11                80
 05/24/2018   22:11:29   (  -0.07,-135.20) (   0.77,-131.40)  432.91                80
 05/26/2018   10:30:37   (   0.05,-135.14) (   0.39,-136.67)  175.16                80
 05/27/2018   10:14:33   (   0.05,-135.11) (  -0.63,-132.14)  338.47                80
 05/28/2018   22:33:49   (  -0.03,-135.09) (  -0.54,-137.45)  268.46                80
 05/29/2018   22:17:44   (  -0.04,-135.06) (   0.42,-132.91)  244.91                80
 05/31/2018   10:36:52   (   0.02,-134.98) (   0.74,-138.18)  364.12                80
 06/01/2018   10:20:48   (   0.03,-134.95) (  -0.29,-133.65)  148.85                80
 06/02/2018   22:40:04   (  -0.01,-134.92) (  -0.88,-138.95)  459.33                80
 06/03/2018   22:23:58   (  -0.02,-134.88) (   0.08,-134.41)   53.45                80