Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 12 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 12/25/2017   22:24:24   (   0.04,-135.27) (   0.21,-134.55)   81.90                80
 12/28/2017   10:24:46   (  -0.04,-135.29) (  -0.04,-135.28)    1.11                80
 12/30/2017   22:27:55   (   0.04,-135.16) (  -0.16,-136.05)  101.04                80
 12/31/2017   22:11:50   (   0.03,-135.13) (   0.84,-131.51)  412.73                80
 01/02/2018   10:30:57   (  -0.04,-135.16) (   0.33,-136.78)  185.06                80
 01/03/2018   10:14:52   (  -0.03,-135.13) (  -0.67,-132.25)  328.44                80
 01/04/2018   22:34:07   (   0.04,-135.01) (  -0.51,-137.55)  288.56                80
 01/05/2018   22:18:02   (   0.04,-134.98) (   0.49,-133.01)  224.60                80
 01/07/2018   10:37:09   (  -0.05,-135.00) (   0.68,-138.28)  374.16                80