Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2017 12 20.  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)
 12/21/2017   06:27:31   (   0.10,-135.40) (   0.22,-134.70)   78.07                80
 12/22/2017   18:46:22   (  -0.08,-135.32) (   0.80,-139.26)  449.37                80
 12/23/2017   18:28:22   (  -0.09,-135.31) (  -0.30,-134.27)  118.32                80
 12/25/2017   06:47:24   (   0.07,-135.34) (  -0.70,-138.87)  401.56                80
 12/26/2017   06:24:04   (   0.08,-135.32) (   0.40,-133.87)  165.32                80
 12/27/2017   18:42:56   (  -0.07,-135.24) (   0.63,-138.43)  363.63                80
 12/28/2017   18:24:56   (  -0.07,-135.22) (  -0.48,-133.44)  203.18                80
 12/30/2017   06:43:56   (   0.06,-135.24) (  -0.58,-138.03)  317.81                80
 12/31/2017   06:20:37   (   0.07,-135.21) (   0.53,-133.03)  248.08                80
 01/01/2018   18:39:28   (  -0.06,-135.11) (   0.50,-137.59)  282.90                80
 01/02/2018   18:21:29   (  -0.06,-135.08) (  -0.61,-132.59)  282.95                80