Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/05/2018   10:12:02   (   0.01,-128.60) (   0.74,-131.95)  381.80                80
 12/06/2018   09:55:56   (   0.03,-128.61) (  -0.23,-127.41)  136.23                80
 12/07/2018   22:15:13   (  -0.00,-128.52) (  -0.97,-132.72)  479.25                80
 12/08/2018   21:59:08   (  -0.02,-128.53) (   0.06,-128.19)   38.83                80
 12/11/2018   10:02:12   (   0.01,-128.67) (   0.04,-128.94)   30.51                80
 12/12/2018   09:43:27   (   0.02,-128.68) (  -0.93,-124.40)  486.97                80
 12/13/2018   22:02:43   (   0.00,-128.57) (  -0.26,-129.71)  129.62                80
 12/14/2018   21:46:38   (  -0.01,-128.58) (   0.77,-125.18)  387.90                80
 12/16/2018   10:05:47   (  -0.02,-128.71) (   0.36,-130.46)  199.28                80
 12/17/2018   09:49:41   (  -0.00,-128.71) (  -0.61,-125.92)  317.67                80