Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 5 25.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 05/26/2021   22:17:37   (  -0.06,-128.35) (  -0.54,-130.36)  230.19                80
 05/27/2021   22:01:20   (  -0.06,-128.36) (   0.50,-125.77)  294.59                80
 05/29/2021   10:22:48   (   0.06,-128.45) (   0.61,-130.96)  285.33                80
 05/30/2021   10:01:11   (   0.07,-128.46) (  -0.43,-126.37)  238.77                80
 05/31/2021   22:22:46   (  -0.07,-128.40) (  -0.81,-131.57)  361.82                80
 06/01/2021   22:06:29   (  -0.07,-128.42) (   0.24,-126.98)  162.85                80
 06/03/2021   10:27:57   (   0.07,-128.52) (   0.87,-132.17)  416.25                80
 06/04/2021   10:06:18   (   0.07,-128.52) (  -0.12,-127.57)  107.88                80
 06/05/2021   22:27:55   (  -0.07,-128.46) (  -1.06,-132.78)  493.84                80
 06/06/2021   22:11:37   (  -0.07,-128.47) (  -0.02,-128.20)   30.41                80