Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/02/2018   22:08:58   (  -0.02,-128.45) (  -0.66,-131.19)  313.61                80
 12/03/2018   21:52:53   (  -0.03,-128.47) (   0.37,-126.67)  205.11                80
 12/05/2018   10:12:02   (   0.01,-128.60) (   0.76,-131.95)  382.12                80
 12/06/2018   09:55:57   (   0.03,-128.61) (  -0.27,-127.42)  135.92                80
 12/07/2018   22:15:13   (  -0.00,-128.52) (  -0.93,-132.73)  478.89                80
 12/08/2018   21:59:08   (  -0.02,-128.53) (   0.04,-128.19)   39.23                80
 12/11/2018   09:59:32   (   0.01,-128.67) (   0.06,-128.94)   30.75                80
 12/12/2018   09:43:26   (   0.02,-128.68) (  -0.92,-124.40)  486.63                80
 12/13/2018   22:02:43   (   0.00,-128.58) (  -0.27,-129.71)  129.26                80
 12/14/2018   21:46:38   (  -0.01,-128.59) (   0.76,-125.18)  388.26                80