Simultaneous Nadir Overpasses (SNOs) between GOES-15 and FY3D
TLE Epoch: 2021 6 24.  Predictions up to the next  14.0 days:

     Date     Time(GOES-15)   GOES-15 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/25/2021   10:07:54   (   0.00,-128.38) (  -0.10,-127.81)   64.89                80
 06/27/2021   22:10:32   (  -0.00,-128.25) (  -0.05,-128.43)   20.53                80
 06/30/2021   10:13:02   (  -0.00,-128.29) (   0.13,-129.02)   82.49                80
 07/01/2021   09:56:44   (   0.01,-128.27) (  -0.85,-124.42)  438.80                80
 07/02/2021   22:15:40   (   0.01,-128.15) (  -0.33,-129.63)  168.50                80
 07/03/2021   21:59:23   (   0.00,-128.14) (   0.72,-125.05)  352.76                80
 07/05/2021   10:18:10   (  -0.02,-128.19) (   0.42,-130.22)  231.08                80
 07/06/2021   10:01:51   (  -0.01,-128.17) (  -0.57,-125.63)  289.51                80
 07/07/2021   22:20:48   (   0.03,-128.03) (  -0.60,-130.84)  319.43                80