Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2021 12 13.  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)
 12/13/2021   18:07:56   (  -0.16,-127.82) (   0.11,-128.93)  126.56                80
 12/14/2021   17:44:36   (  -0.17,-127.79) (  -1.02,-123.93)  438.63                80
 12/16/2021   06:06:15   (   0.15,-127.70) (  -0.03,-128.52)   94.09                80
 12/17/2021   05:42:56   (   0.16,-127.66) (   1.09,-123.53)  470.63                80
 12/18/2021   18:04:27   (  -0.14,-127.63) (  -0.07,-128.09)   52.33                80
 12/21/2021   06:02:46   (   0.13,-127.49) (   0.08,-127.67)   21.59                80
 12/23/2021   18:00:57   (  -0.12,-127.40) (  -0.13,-127.23)   18.99                80
 12/26/2021   05:56:37   (   0.11,-127.25) (   0.20,-126.82)   48.33                80