Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 4 7.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 04/07/2021   22:47:38   (   0.03,-137.21) (  -0.21,-138.25)  118.49                80
 04/08/2021   22:31:21   (   0.03,-137.21) (   0.81,-133.66)  404.21                80
 04/10/2021   10:52:49   (  -0.03,-137.20) (   0.36,-138.84)  187.54                80
 04/11/2021   10:31:12   (  -0.03,-137.20) (  -0.66,-134.25)  334.80                80
 04/12/2021   22:52:48   (   0.03,-137.19) (  -0.50,-139.47)  259.36                80
 04/13/2021   22:36:31   (   0.03,-137.19) (   0.53,-134.88)  262.68                80
 04/15/2021   10:57:59   (  -0.03,-137.16) (   0.64,-140.06)  330.17                80
 04/16/2021   10:36:21   (  -0.03,-137.15) (  -0.38,-135.47)  191.29                80
 04/17/2021   22:57:58   (   0.02,-137.13) (  -0.77,-140.68)  404.42                80
 04/18/2021   22:41:40   (   0.02,-137.12) (   0.26,-136.10)  116.69                80
 04/20/2021   11:03:09   (  -0.01,-137.08) (   0.92,-141.27)  477.44                80