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)
 10/20/2017   10:21:27   (   0.18,-135.22) (  -0.16,-133.71)  171.58                80
 10/21/2017   22:40:43   (  -0.16,-135.11) (  -1.03,-139.02)  445.30                80
 10/22/2017   22:24:39   (  -0.17,-135.09) (  -0.01,-134.49)   68.54                80
 10/25/2017   10:27:41   (   0.16,-135.08) (   0.18,-135.23)   17.26                80
 10/26/2017   10:08:56   (   0.17,-135.04) (  -0.79,-130.69)  495.55                80
 10/27/2017   22:28:12   (  -0.14,-134.92) (  -0.41,-136.00)  123.26                80
 10/28/2017   22:12:08   (  -0.15,-134.89) (   0.62,-131.47)  389.60                80
 10/30/2017   10:31:16   (   0.13,-134.91) (   0.51,-136.75)  209.90                80
 10/31/2017   10:15:11   (   0.14,-134.87) (  -0.45,-132.21)  302.25                80
 11/01/2017   22:34:27   (  -0.11,-134.73) (  -0.74,-137.52)  318.43                80