Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/06/2018   09:55:57   (   0.02,-128.60) (  -0.26,-127.42)  135.44                80
 12/07/2018   22:15:13   (  -0.00,-128.51) (  -0.94,-132.72)  479.47                80
 12/08/2018   21:59:08   (  -0.02,-128.53) (   0.03,-128.18)   38.52                80
 12/11/2018   09:59:32   (   0.01,-128.65) (   0.07,-128.94)   32.19                80
 12/12/2018   09:43:27   (   0.02,-128.66) (  -0.96,-124.41)  484.98                80
 12/13/2018   22:02:43   (   0.01,-128.56) (  -0.23,-129.72)  131.05                80
 12/14/2018   21:46:38   (  -0.00,-128.57) (   0.74,-125.18)  386.28                80
 12/16/2018   10:05:46   (  -0.02,-128.69) (   0.39,-130.46)  202.11                80
 12/17/2018   09:49:42   (  -0.01,-128.69) (  -0.64,-125.93)  314.64                80
 12/18/2018   22:08:57   (   0.02,-128.57) (  -0.60,-131.22)  302.71                80