Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2021 9 19.  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,-127.93) (   0.16,-128.56)   71.97                80
 09/21/2021   05:45:43   (   0.29,-127.90) (   1.27,-123.56)  494.33                80
 09/22/2021   18:01:54   (  -0.32,-127.81) (  -0.26,-128.12)   35.19                80
 09/25/2021   06:00:15   (   0.32,-127.77) (   0.32,-127.71)    6.32                80
 09/27/2021   18:01:07   (  -0.33,-127.63) (  -0.43,-127.28)   41.20                80
 09/29/2021   06:17:27   (   0.34,-127.62) (  -0.62,-131.87)  484.33                80
 09/30/2021   05:59:28   (   0.33,-127.58) (   0.50,-126.87)   80.81                80
 10/01/2021   18:15:39   (  -0.34,-127.47) (   0.51,-131.43)  451.02                80
 10/02/2021   17:57:39   (  -0.33,-127.43) (  -0.54,-126.42)  113.94                80