Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2017 12 21.  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)
 12/22/2017   18:46:22   (  -0.08,-135.32) (   0.79,-139.26)  449.44                80
 12/23/2017   18:28:23   (  -0.09,-135.31) (  -0.31,-134.27)  118.23                80
 12/25/2017   06:47:24   (   0.07,-135.34) (  -0.69,-138.87)  401.68                80
 12/26/2017   06:24:04   (   0.08,-135.32) (   0.41,-133.88)  165.19                80
 12/27/2017   18:42:56   (  -0.07,-135.24) (   0.62,-138.43)  363.76                80
 12/28/2017   18:24:56   (  -0.07,-135.22) (  -0.48,-133.44)  203.04                80
 12/30/2017   06:43:57   (   0.06,-135.24) (  -0.57,-138.03)  318.00                80
 12/31/2017   06:20:37   (   0.07,-135.21) (   0.53,-133.03)  247.88                80
 01/01/2018   18:39:28   (  -0.06,-135.11) (   0.50,-137.59)  283.11                80
 01/02/2018   18:21:29   (  -0.06,-135.08) (  -0.61,-132.59)  282.72                80
 01/04/2018   06:40:29   (   0.05,-135.09) (  -0.44,-137.19)  239.16                80