Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 5 10.  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)
 05/11/2021   01:15:01   ( -69.68, -19.10) 05/11/2021   01:15:39  ( -69.69, -19.10)    0.93                38
 05/11/2021   02:05:45   (  69.57, 148.37) 05/11/2021   02:05:06  (  69.59, 148.41)    2.28                39
 05/13/2021   17:31:21   ( -69.72,  96.78) 05/13/2021   17:32:05  ( -69.71,  96.82)    1.48                44
 05/13/2021   18:22:05   (  69.61, -95.75) 05/13/2021   18:21:32  (  69.60, -95.69)    2.50                33
 05/16/2021   09:47:39   ( -69.70,-147.26) 05/16/2021   09:48:30  ( -69.73,-147.28)    2.99                51
 05/16/2021   10:38:23   (  69.59,  20.21) 05/16/2021   10:37:57  (  69.62,  20.21)    2.59                26
 05/16/2021   11:28:49   ( -68.70,-171.21) 05/16/2021   11:27:41  ( -68.74,-173.30)   84.44                68
 05/19/2021   02:03:59   ( -69.74, -31.38) 05/19/2021   02:04:56  ( -69.74, -31.38)    0.35                57
 05/19/2021   02:54:43   (  69.64, 136.09) 05/19/2021   02:54:23  (  69.63, 136.11)    1.38                20
 05/19/2021   03:45:12   ( -68.90, -55.54) 05/19/2021   03:44:03  ( -68.97, -57.12)   63.62                69
 05/21/2021   18:20:18   ( -69.74,  84.57) 05/21/2021   18:21:22  ( -69.75,  84.51)    2.81                64
 05/21/2021   19:11:02   (  69.63,-107.96) 05/21/2021   19:10:49  (  69.63,-108.01)    1.76                13
 05/21/2021   20:01:36   ( -69.16,  60.04) 05/21/2021   20:00:25  ( -69.20,  59.05)   39.32                71