Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 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)
 06/27/2021   22:10:33   (   0.00,-128.25) (  -0.02,-128.43)   20.75                80
 06/30/2021   10:13:02   (  -0.00,-128.29) (   0.17,-129.01)   82.86                80
 07/01/2021   09:56:44   (   0.01,-128.27) (  -0.88,-124.43)  438.33                80
 07/02/2021   22:15:40   (   0.01,-128.15) (  -0.30,-129.64)  168.92                80
 07/03/2021   21:59:22   (   0.00,-128.13) (   0.69,-125.04)  352.29                80
 07/05/2021   10:18:09   (  -0.02,-128.19) (   0.45,-130.22)  231.76                80
 07/06/2021   10:01:52   (  -0.01,-128.16) (  -0.59,-125.63)  288.78                80
 07/07/2021   22:20:48   (   0.03,-128.03) (  -0.58,-130.84)  320.12                80
 07/08/2021   22:04:30   (   0.03,-128.00) (   0.42,-126.24)  200.25                80