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)
 01/08/2018   10:21:04   (  -0.05,-134.97) (  -0.33,-133.74)  139.84                80
 01/09/2018   22:40:19   (   0.06,-134.87) (  -0.86,-139.05)  475.38                80
 01/10/2018   22:24:14   (   0.05,-134.83) (   0.14,-134.51)   37.38                80
 01/13/2018   10:24:35   (  -0.04,-134.78) (   0.08,-135.23)   52.02                80
 01/14/2018   10:08:29   (  -0.04,-134.74) (  -0.92,-130.69)  460.38                80
 01/15/2018   22:27:44   (   0.04,-134.63) (  -0.26,-136.00)  155.90                80
 01/16/2018   22:11:39   (   0.03,-134.58) (   0.74,-131.46)  355.90                80
 01/18/2018   10:30:46   (  -0.04,-134.55) (   0.42,-136.73)  247.42                80
 01/19/2018   10:14:41   (  -0.04,-134.51) (  -0.58,-132.19)  264.22                80
 01/20/2018   22:36:35   (   0.04,-134.39) (  -0.65,-137.48)  352.72                80
 01/21/2018   22:15:10   (   0.04,-134.34) (   0.35,-132.95)  158.37                80