Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2018 9 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)
 09/22/2018   06:35:18   (   0.27,-135.49) (  -0.10,-137.26)  200.75                80
 09/23/2018   06:17:19   (   0.26,-135.51) (   1.01,-132.26)  370.28                80
 09/24/2018   18:33:31   (  -0.28,-135.60) (  -0.02,-136.83)  139.99                80
 09/25/2018   18:15:32   (  -0.27,-135.62) (  -1.12,-131.83)  431.20                80
 09/27/2018   06:31:52   (   0.29,-135.57) (   0.08,-136.43)   98.30                80
 09/28/2018   06:13:52   (   0.27,-135.57) (   1.18,-131.43)  471.90                80
 09/29/2018   18:30:05   (  -0.29,-135.65) (  -0.19,-136.00)   40.41                80
 10/02/2018   06:31:06   (   0.29,-135.60) (   0.32,-135.61)    2.68                80
 10/04/2018   18:29:19   (  -0.30,-135.64) (  -0.41,-135.17)   53.96                80