Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 23.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/23/2021   22:34:13   (   0.04,-137.20) (   0.61,-134.60)  295.87                44
 03/25/2021   10:56:17   (  -0.03,-137.21) (   0.55,-139.78)  293.25                80
 03/26/2021   10:34:39   (  -0.03,-137.21) (  -0.47,-135.19)  229.64                80
 03/27/2021   22:58:56   (   0.02,-137.20) (  -0.72,-140.40)  365.45                80
 03/28/2021   22:37:19   (   0.03,-137.20) (   0.36,-135.83)  157.16                80
 03/30/2021   11:01:26   (  -0.03,-137.20) (   0.86,-140.99)  433.21                80
 03/31/2021   10:39:50   (  -0.03,-137.19) (  -0.22,-136.42)   88.79                80
 04/02/2021   22:42:29   (   0.03,-137.16) (   0.07,-137.04)   13.92                80
 04/05/2021   10:47:40   (  -0.02,-137.13) (   0.08,-137.63)   56.78                80