Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2021 9 17.  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)
 09/17/2021   18:05:21   (  -0.30,-127.96) (  -0.09,-128.96)  113.88                80
 09/18/2021   17:47:22   (  -0.28,-127.93) (  -1.20,-123.96)  452.78                80
 09/20/2021   06:03:42   (   0.31,-127.93) (   0.15,-128.55)   71.53                80
 09/21/2021   05:45:43   (   0.29,-127.90) (   1.26,-123.56)  494.94                80
 09/22/2021   18:01:54   (  -0.32,-127.81) (  -0.25,-128.12)   34.64                80
 09/25/2021   06:00:15   (   0.32,-127.78) (   0.31,-127.71)    7.93                80
 09/27/2021   18:01:07   (  -0.33,-127.65) (  -0.41,-127.27)   42.36                80
 09/29/2021   06:17:27   (   0.34,-127.64) (  -0.63,-131.87)  482.63                80
 09/30/2021   05:59:27   (   0.33,-127.60) (   0.48,-126.87)   82.64                80