Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2017 12 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  METOP-B Lat/Lon    Distance(km)  Time Diff(sec)
 12/12/2017   06:13:44   (   0.13,-135.43) (   1.03,-131.38)  461.09                80
 12/13/2017   18:32:36   (  -0.12,-135.40) (   0.00,-135.94)   61.88                80
 12/16/2017   06:33:37   (   0.12,-135.44) (   0.09,-135.54)   11.62                80
 12/18/2017   18:31:49   (  -0.11,-135.39) (  -0.15,-135.10)   32.22                80
 12/20/2017   06:50:51   (   0.09,-135.43) (  -0.85,-139.71)  486.78                80
 12/21/2017   06:27:31   (   0.10,-135.42) (   0.25,-134.71)   81.11                80
 12/22/2017   18:46:22   (  -0.08,-135.36) (   0.78,-139.27)  445.41                80
 12/23/2017   18:28:23   (  -0.09,-135.35) (  -0.32,-134.27)  122.72                80
 12/25/2017   06:47:24   (   0.08,-135.39) (  -0.69,-138.87)  396.74                80