Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 11 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)
 11/22/2018   21:59:07   (  -0.07,-128.23) (  -0.08,-128.14)   10.51                80
 11/25/2018   09:59:31   (   0.07,-128.40) (   0.19,-128.89)   56.79                80
 11/26/2018   09:43:26   (   0.08,-128.41) (  -0.84,-124.37)  461.67                80
 11/27/2018   22:02:42   (  -0.05,-128.34) (  -0.36,-129.67)  152.40                80
 11/28/2018   21:46:38   (  -0.06,-128.35) (   0.66,-125.14)  366.27                80
 11/30/2018   10:05:46   (   0.03,-128.49) (   0.47,-130.42)  220.19                80
 12/01/2018   09:49:42   (   0.05,-128.51) (  -0.56,-125.90)  297.95                80
 12/02/2018   22:08:58   (  -0.02,-128.42) (  -0.64,-131.20)  317.36                80
 12/03/2018   21:52:53   (  -0.03,-128.43) (   0.33,-126.66)  201.14                80