Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 29.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/30/2017   22:27:55   (   0.04,-135.17) (  -0.18,-136.04)  100.19                80
 12/31/2017   22:11:51   (   0.04,-135.14) (   0.87,-131.52)  413.86                80
 01/02/2018   10:30:58   (  -0.04,-135.17) (   0.29,-136.79)  183.72                80
 01/03/2018   10:14:53   (  -0.04,-135.14) (  -0.70,-132.25)  329.99                80
 01/04/2018   22:34:07   (   0.04,-135.03) (  -0.54,-137.54)  286.69                80
 01/05/2018   22:18:02   (   0.04,-135.00) (   0.51,-133.02)  226.71                80
 01/07/2018   10:37:10   (  -0.05,-135.02) (   0.66,-138.29)  371.75                80
 01/08/2018   10:21:04   (  -0.04,-134.99) (  -0.34,-133.75)  141.67                80
 01/09/2018   22:40:18   (   0.05,-134.87) (  -0.90,-139.04)  475.03                80
 01/10/2018   22:24:13   (   0.04,-134.84) (   0.10,-134.50)   38.04                80