Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 6 5.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 06/05/2021   22:28:27   (  -0.00,-137.18) (   0.86,-133.21)  452.29                80
 06/07/2021   10:52:35   (   0.01,-137.17) (   0.29,-138.39)  138.67                80
 06/08/2021   10:30:57   (   0.00,-137.16) (  -0.75,-133.80)  383.32                80
 06/09/2021   22:55:14   (   0.00,-137.15) (  -0.43,-139.01)  212.50                80
 06/10/2021   22:36:16   (   0.00,-137.14) (   0.61,-134.42)  309.08                80
 06/12/2021   10:57:43   (  -0.01,-137.11) (   0.54,-139.60)  283.30                80
 06/13/2021   10:36:05   (  -0.01,-137.09) (  -0.45,-135.00)  237.84                80
 06/14/2021   22:57:41   (   0.01,-137.06) (  -0.73,-140.21)  359.43                80
 06/15/2021   22:41:24   (   0.01,-137.04) (   0.32,-135.63)  161.49                80
 06/17/2021   11:02:51   (  -0.00,-137.01) (   0.83,-140.80)  431.75                80
 06/18/2021   10:41:13   (  -0.00,-136.99) (  -0.16,-136.20)   88.83                80