Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/08/2018   21:59:08   (  -0.02,-128.52) (   0.07,-128.19)   38.24                80
 12/11/2018   09:59:31   (   0.01,-128.65) (   0.09,-128.93)   32.63                80
 12/12/2018   09:43:27   (   0.02,-128.65) (  -0.94,-124.40)  484.49                80
 12/13/2018   22:02:43   (   0.01,-128.55) (  -0.25,-129.71)  131.64                80
 12/14/2018   21:46:38   (  -0.00,-128.56) (   0.72,-125.17)  385.58                80
 12/16/2018   10:05:46   (  -0.02,-128.68) (   0.40,-130.45)  202.97                80
 12/17/2018   09:49:41   (  -0.01,-128.68) (  -0.62,-125.93)  313.72                80
 12/18/2018   22:08:58   (   0.02,-128.56) (  -0.55,-131.23)  303.74                80
 12/19/2018   21:52:52   (   0.01,-128.56) (   0.42,-126.69)  212.78                80
 12/21/2018   10:12:00   (  -0.03,-128.67) (   0.71,-131.97)  376.48                80