Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2018 10 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)
 10/08/2018   22:40:41   (  -0.27,-135.59) (  -1.00,-138.93)  380.10                80
 10/09/2018   22:24:37   (  -0.28,-135.59) (   0.01,-134.39)  136.38                80
 10/11/2018   10:43:45   (   0.26,-135.63) (   1.16,-139.66)  460.06                80
 10/12/2018   10:27:41   (   0.27,-135.62) (   0.15,-135.13)   55.51                80
 10/14/2018   22:28:13   (  -0.26,-135.54) (  -0.33,-135.90)   41.28                80
 10/15/2018   22:12:08   (  -0.27,-135.53) (   0.69,-131.37)  474.33                80
 10/17/2018   10:31:16   (   0.24,-135.56) (   0.48,-136.64)  123.01                80
 10/18/2018   10:15:12   (   0.25,-135.54) (  -0.54,-132.11)  391.77                80
 10/19/2018   22:34:28   (  -0.22,-135.45) (  -0.64,-137.41)  222.49                80
 10/20/2018   22:18:23   (  -0.24,-135.44) (   0.32,-132.87)  292.61                80