Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2021 4 1.  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)
 04/01/2021   18:03:45   (   0.13,-128.36) (   0.04,-128.06)   35.31                80
 04/04/2021   05:59:24   (  -0.13,-128.23) (   0.03,-127.65)   66.05                80
 04/05/2021   18:18:16   (   0.12,-128.29) (   0.98,-132.22)  446.73                80
 04/06/2021   18:00:15   (   0.12,-128.28) (  -0.10,-127.21)  120.78                80
 04/08/2021   06:19:14   (  -0.11,-128.16) (  -0.91,-131.81)  415.61                80
 04/09/2021   05:55:54   (  -0.12,-128.14) (   0.17,-126.81)  151.59                80
 04/10/2021   18:14:45   (   0.11,-128.20) (   0.83,-131.37)  361.41                80
 04/11/2021   17:56:46   (   0.12,-128.18) (  -0.31,-126.38)  206.08                80
 04/13/2021   06:15:44   (  -0.11,-128.06) (  -0.76,-130.96)  330.42                80
 04/14/2021   05:52:24   (  -0.11,-128.04) (   0.32,-125.96)  236.28                80