Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 10 19.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/19/2017   10:37:32   (   0.17,-135.24) (   0.84,-138.24)  342.14                80
 10/20/2017   10:21:26   (   0.19,-135.22) (  -0.12,-133.70)  171.63                80
 10/21/2017   22:40:43   (  -0.16,-135.11) (  -1.02,-139.02)  445.20                80
 10/22/2017   22:24:38   (  -0.17,-135.09) (  -0.05,-134.48)   68.63                80
 10/25/2017   10:25:01   (   0.16,-135.08) (   0.22,-135.22)   17.12                80
 10/26/2017   10:08:56   (   0.17,-135.05) (  -0.81,-130.70)  495.84                80
 10/27/2017   22:28:13   (  -0.15,-134.93) (  -0.39,-136.00)  122.86                80
 10/28/2017   22:12:07   (  -0.15,-134.89) (   0.58,-131.46)  390.04                80
 10/30/2017   10:31:15   (   0.13,-134.91) (   0.55,-136.75)  209.40                80
 10/31/2017   10:15:11   (   0.14,-134.87) (  -0.48,-132.22)  302.79                80
 11/01/2017   22:34:27   (  -0.11,-134.73) (  -0.71,-137.53)  317.84                80