Simultaneous Nadir Overpasses (SNOs) between GOES-17 and FY3D
TLE Epoch: 2021 3 10.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 03/10/2021   10:38:06   (  -0.04,-137.21) (  -0.31,-136.13)  123.87                80
 03/11/2021   22:59:42   (   0.03,-137.22) (  -0.91,-141.33)  469.84                80
 03/12/2021   22:43:25   (   0.03,-137.22) (   0.11,-136.74)   52.99                80
 03/15/2021   10:45:56   (  -0.03,-137.20) (   0.02,-137.34)   16.17                80
 03/17/2021   22:45:56   (   0.03,-137.19) (  -0.15,-137.97)   88.61                80
 03/18/2021   22:29:38   (   0.03,-137.19) (   0.87,-133.38)  433.26                80
 03/20/2021   10:51:06   (  -0.03,-137.16) (   0.28,-138.56)  159.64                80
 03/21/2021   10:29:29   (  -0.03,-137.15) (  -0.74,-133.97)  361.66                80
 03/22/2021   22:51:05   (   0.02,-137.13) (  -0.45,-139.18)  234.49                80
 03/23/2021   22:34:48   (   0.01,-137.11) (   0.57,-134.60)  286.52                80