Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 12 1.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/01/2021   22:43:02   (   0.00,-137.20) (   0.55,-134.74)  280.00                80
 12/03/2021   11:02:43   (  -0.00,-137.20) (   0.64,-140.14)  335.10                80
 12/04/2021   10:47:01   (   0.00,-137.19) (  -0.35,-135.69)  171.01                80
 12/05/2021   23:06:51   (  -0.00,-137.17) (  -0.92,-141.11)  450.10                80
 12/06/2021   22:51:10   (  -0.01,-137.16) (   0.13,-136.68)   55.63                80
 12/09/2021   10:52:27   (   0.01,-137.13) (   0.13,-137.61)   55.40                80
 12/10/2021   10:36:45   (   0.01,-137.12) (  -0.86,-133.17)  450.05                80
 12/11/2021   22:56:36   (  -0.00,-137.10) (  -0.34,-138.60)  171.61                80
 12/12/2021   22:40:54   (  -0.00,-137.08) (   0.66,-134.16)  333.75                80
 12/14/2021   11:03:15   (   0.00,-137.06) (   0.54,-139.55)  283.07                80