Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 12 27.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/28/2018   09:43:25   (  -0.03,-128.61) (  -0.98,-124.42)  477.93                80
 12/29/2018   22:02:40   (   0.04,-128.49) (  -0.25,-129.71)  140.08                80
 12/30/2018   21:46:35   (   0.04,-128.48) (   0.78,-125.19)  375.53                80
 01/01/2019   10:05:43   (  -0.05,-128.57) (   0.40,-130.46)  215.67                80
 01/02/2019   09:49:38   (  -0.04,-128.56) (  -0.63,-125.93)  299.49                80
 01/03/2019   22:08:54   (   0.05,-128.42) (  -0.59,-131.22)  319.53                80
 01/04/2019   21:52:49   (   0.04,-128.41) (   0.45,-126.70)  195.52                80
 01/06/2019   10:11:56   (  -0.05,-128.49) (   0.74,-131.97)  396.16                80
 01/07/2019   09:55:52   (  -0.04,-128.47) (  -0.30,-127.44)  118.46                80
 01/09/2019   21:59:02   (   0.05,-128.31) (   0.07,-128.20)   12.99                80