Simultaneous Nadir Overpasses (SNOs) between GOES-15 and NPP
TLE Epoch: 2017 10 20.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  NPP Lat/Lon    Distance(km)  Time Diff(sec)
 10/21/2017   22:40:43   (  -0.16,-135.11) (  -1.04,-139.02)  445.38                80
 10/22/2017   22:24:38   (  -0.17,-135.08) (  -0.02,-134.49)   68.38                80
 10/25/2017   10:26:35   (   0.16,-135.08) (   0.18,-135.23)   17.40                14
 10/26/2017   10:08:56   (   0.17,-135.04) (  -0.78,-130.69)  495.34                80
 10/27/2017   22:28:12   (  -0.14,-134.92) (  -0.41,-136.00)  123.62                80
 10/28/2017   22:12:08   (  -0.15,-134.88) (   0.61,-131.47)  389.20                80
 10/30/2017   10:31:16   (   0.13,-134.90) (   0.52,-136.75)  210.29                80
 10/31/2017   10:15:11   (   0.14,-134.86) (  -0.45,-132.21)  301.81                80
 11/01/2017   22:34:27   (  -0.11,-134.72) (  -0.74,-137.52)  319.00                80
 11/02/2017   22:18:21   (  -0.13,-134.68) (   0.23,-132.98)  193.13                80