Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 8.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/09/2018   22:40:18   (   0.06,-134.87) (  -0.90,-139.04)  475.37                80
 01/10/2018   22:24:13   (   0.05,-134.83) (   0.10,-134.50)   37.45                80
 01/13/2018   10:24:35   (  -0.04,-134.78) (   0.07,-135.23)   51.95                80
 01/14/2018   10:08:29   (  -0.04,-134.74) (  -0.93,-130.70)  460.39                80
 01/15/2018   22:27:45   (   0.04,-134.63) (  -0.25,-136.00)  155.89                80
 01/16/2018   22:11:39   (   0.03,-134.58) (   0.75,-131.46)  355.93                80
 01/18/2018   10:30:45   (  -0.04,-134.55) (   0.47,-136.72)  247.38                80
 01/19/2018   10:14:40   (  -0.04,-134.51) (  -0.53,-132.18)  264.24                80
 01/20/2018   22:36:35   (   0.04,-134.39) (  -0.64,-137.49)  352.68                80
 01/21/2018   22:15:27   (   0.04,-134.34) (   0.36,-132.95)  158.42                63