Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 28.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/28/2021   22:39:59   (   0.04,-137.21) (   0.37,-135.83)  158.72                80
 03/30/2021   11:01:28   (  -0.04,-137.21) (   0.79,-141.01)  431.83                80
 03/31/2021   10:39:50   (  -0.04,-137.21) (  -0.23,-136.42)   90.42                80
 04/02/2021   22:45:09   (   0.04,-137.19) (   0.08,-137.04)   16.76                80
 04/05/2021   10:47:40   (  -0.03,-137.16) (   0.06,-137.63)   53.67                80
 04/06/2021   10:26:02   (  -0.03,-137.15) (  -0.96,-133.04)  467.79                80
 04/07/2021   22:47:38   (   0.02,-137.12) (  -0.26,-138.24)  128.64                80
 04/08/2021   22:31:20   (   0.02,-137.11) (   0.77,-133.66)  392.87                80
 04/10/2021   10:52:49   (  -0.01,-137.09) (   0.35,-138.85)  199.61                80