Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 5 8.  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)
 05/08/2021   08:58:41   ( -69.66,-135.01) 05/08/2021   08:59:13  ( -69.65,-135.03)    1.33                32
 05/08/2021   09:49:25   (  69.55,  32.46) 05/08/2021   09:48:40  (  69.55,  32.48)    0.86                45
 05/11/2021   01:15:01   ( -69.69, -19.12) 05/11/2021   01:15:39  ( -69.68, -19.11)    1.43                38
 05/11/2021   02:05:45   (  69.58, 148.35) 05/11/2021   02:05:06  (  69.57, 148.39)    2.00                39
 05/13/2021   17:31:21   ( -69.72,  96.77) 05/13/2021   17:32:05  ( -69.70,  96.80)    2.78                44
 05/13/2021   18:22:04   (  69.56, -95.68) 05/13/2021   18:21:32  (  69.59, -95.71)    3.04                32
 05/16/2021   09:47:40   ( -69.70,-147.26) 05/16/2021   09:48:31  ( -69.72,-147.30)    1.89                51
 05/16/2021   10:38:24   (  69.60,  20.20) 05/16/2021   10:37:58  (  69.60,  20.19)    0.63                26
 05/16/2021   11:28:49   ( -68.65,-171.14) 05/16/2021   11:27:42  ( -68.72,-173.31)   88.29                67
 05/19/2021   02:03:59   ( -69.74, -31.38) 05/19/2021   02:04:56  ( -69.73, -31.40)    1.58                57
 05/19/2021   02:54:43   (  69.64, 136.09) 05/19/2021   02:54:23  (  69.61, 136.09)    2.68                20
 05/19/2021   03:45:12   ( -68.90, -55.54) 05/19/2021   03:44:03  ( -68.96, -57.14)   64.25                69
 05/21/2021   18:20:19   ( -69.78,  84.50) 05/21/2021   18:21:21  ( -69.79,  84.57)    2.80                62
 05/21/2021   19:11:02   (  69.62,-107.95) 05/21/2021   19:10:49  (  69.62,-108.03)    2.84                13
 05/21/2021   20:01:36   ( -69.15,  60.05) 05/21/2021   20:00:25  ( -69.19,  59.04)   40.28                71