Simultaneous Nadir Overpasses (SNOs) between GOES-15 and METOP-B
TLE Epoch: 2021 6 28.  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)
 06/30/2021   06:00:02   (   0.13,-128.24) (   0.22,-127.75)   56.39                80
 07/01/2021   18:18:54   (  -0.12,-128.21) (   0.80,-132.31)  466.85                80
 07/02/2021   18:00:56   (  -0.13,-128.19) (  -0.35,-127.32)  100.20                80
 07/04/2021   06:19:56   (   0.12,-128.17) (  -0.70,-131.91)  426.10                80
 07/05/2021   05:56:37   (   0.13,-128.14) (   0.39,-126.91)  139.82                80
 07/06/2021   18:15:29   (  -0.12,-128.09) (   0.64,-131.47)  385.07                80
 07/07/2021   17:57:31   (  -0.13,-128.07) (  -0.51,-126.48)  181.20                80
 07/09/2021   06:16:31   (   0.12,-128.03) (  -0.53,-131.07)  345.55                80
 07/10/2021   05:53:11   (   0.13,-128.00) (   0.56,-126.07)  219.47                80
 07/11/2021   18:12:04   (  -0.13,-127.93) (   0.47,-130.63)  307.39                80