Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2021 9 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)
 09/20/2021   06:03:42   (   0.31,-127.92) (   0.14,-128.55)   72.16                80
 09/21/2021   05:45:43   (   0.29,-127.89) (   1.25,-123.55)  494.19                80
 09/22/2021   18:01:54   (  -0.32,-127.81) (  -0.24,-128.11)   35.11                80
 09/25/2021   06:02:56   (   0.33,-127.77) (   0.36,-127.72)    6.50                80
 09/27/2021   18:01:07   (  -0.33,-127.63) (  -0.41,-127.27)   41.09                80
 09/29/2021   06:17:27   (   0.34,-127.62) (  -0.63,-131.86)  484.74                80
 09/30/2021   05:59:27   (   0.33,-127.58) (   0.48,-126.87)   80.39                80
 10/01/2021   18:15:39   (  -0.34,-127.47) (   0.53,-131.43)  451.17                80
 10/02/2021   17:57:39   (  -0.33,-127.43) (  -0.58,-126.43)  113.79                80