Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 1 4.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 01/04/2018   22:34:07   (   0.05,-135.03) (  -0.51,-137.55)  286.12                80
 01/05/2018   22:18:02   (   0.04,-135.00) (   0.49,-133.01)  227.29                80
 01/07/2018   10:37:09   (  -0.05,-135.01) (   0.68,-138.28)  372.15                80
 01/08/2018   10:21:04   (  -0.05,-134.98) (  -0.32,-133.74)  141.24                80
 01/09/2018   22:40:19   (   0.05,-134.88) (  -0.86,-139.05)  474.40                80
 01/10/2018   22:24:14   (   0.05,-134.84) (   0.14,-134.51)   38.67                80
 01/13/2018   10:24:35   (  -0.04,-134.81) (   0.03,-135.24)   48.98                80
 01/14/2018   10:08:30   (  -0.04,-134.77) (  -0.97,-130.71)  463.77                80
 01/15/2018   22:27:44   (   0.04,-134.65) (  -0.26,-136.00)  152.92                80
 01/16/2018   22:11:39   (   0.03,-134.61) (   0.74,-131.46)  359.22                80