Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 5 13.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(TERRA) TERRA Lat/Lon    Distance(km)  Time Diff(sec)
 05/13/2021   17:31:21   ( -69.72,  96.77) 05/13/2021   17:32:05  ( -69.71,  96.81)    2.00                44
 05/13/2021   18:22:05   (  69.61, -95.75) 05/13/2021   18:21:32  (  69.60, -95.69)    2.39                33
 05/16/2021   09:47:39   ( -69.72,-147.28) 05/16/2021   09:48:30  ( -69.72,-147.29)    0.81                51
 05/16/2021   10:38:23   (  69.60,  20.20) 05/16/2021   10:37:57  (  69.61,  20.21)    1.16                26
 05/16/2021   11:28:48   ( -68.66,-171.15) 05/16/2021   11:27:41  ( -68.73,-173.31)   87.46                67
 05/19/2021   02:03:58   ( -69.72, -31.35) 05/19/2021   02:04:56  ( -69.73, -31.40)    2.13                58
 05/19/2021   02:54:42   (  69.61, 136.13) 05/19/2021   02:54:23  (  69.61, 136.09)    1.40                19
 05/19/2021   03:45:12   ( -68.93, -55.59) 05/19/2021   03:44:02  ( -69.01, -57.07)   59.90                70
 05/21/2021   18:20:18   ( -69.80,  84.48) 05/21/2021   18:21:21  ( -69.78,  84.55)    3.26                63
 05/21/2021   19:11:01   (  69.63,-107.97) 05/21/2021   19:10:48  (  69.66,-107.96)    3.46                13
 05/21/2021   20:01:35   ( -69.17,  60.03) 05/21/2021   20:00:24  ( -69.23,  59.09)   37.62                71
 05/24/2021   10:36:36   ( -69.78,-159.55) 05/24/2021   10:37:47  ( -69.77,-159.58)    1.36                71
 05/24/2021   11:27:20   (  69.67,   7.92) 05/24/2021   11:27:14  (  69.65,   7.91)    2.02                 6
 05/24/2021   12:17:58   ( -69.41, 175.62) 05/24/2021   12:16:46  ( -69.44, 175.26)   14.61                72
 05/27/2021   02:52:57   ( -69.98, -43.91) 05/27/2021   02:54:09  ( -69.92, -43.49)   17.71                72