Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2021 6 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)
 06/21/2021   05:46:13   (   0.11,-128.40) (   1.01,-124.43)  452.81                80
 06/22/2021   18:05:06   (  -0.11,-128.39) (   0.01,-128.99)   68.04                80
 06/23/2021   17:47:06   (  -0.11,-128.38) (  -1.07,-123.99)  499.61                80
 06/25/2021   06:06:07   (   0.11,-128.34) (   0.06,-128.59)   27.39                80
 06/27/2021   18:04:20   (  -0.12,-128.30) (  -0.13,-128.15)   16.80                80
 06/30/2021   06:00:02   (   0.13,-128.26) (   0.21,-127.75)   57.58                80
 07/01/2021   18:18:54   (  -0.13,-128.22) (   0.81,-132.31)  466.57                80
 07/02/2021   18:00:56   (  -0.13,-128.20) (  -0.33,-127.32)  100.66                80
 07/04/2021   06:19:56   (   0.12,-128.19) (  -0.72,-131.91)  424.27                80