Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2021 6 18.  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)
 06/18/2021   17:50:31   (  -0.11,-128.44) (  -0.89,-124.82)  411.66                80
 06/20/2021   06:09:32   (   0.11,-128.41) (  -0.12,-129.42)  114.50                80
 06/21/2021   05:46:14   (   0.11,-128.40) (   1.02,-124.43)  452.84                80
 06/22/2021   18:05:05   (  -0.11,-128.38) (   0.05,-128.98)   68.52                80
 06/23/2021   17:47:06   (  -0.11,-128.37) (  -1.09,-123.99)  499.12                80
 06/25/2021   06:06:08   (   0.11,-128.34) (   0.08,-128.59)   27.79                80
 06/27/2021   18:04:21   (  -0.12,-128.29) (  -0.14,-128.15)   15.75                80
 06/30/2021   06:00:02   (   0.13,-128.25) (   0.23,-127.75)   56.84                80
 07/01/2021   18:18:55   (  -0.13,-128.21) (   0.79,-132.31)  467.64                80