Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 5 9.  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   01:15:00   ( -69.65, -19.06) 05/11/2021   01:15:39  ( -69.66, -19.13)    3.10                39
 05/11/2021   02:05:44   (  69.54, 148.41) 05/11/2021   02:05:06  (  69.56, 148.37)    2.31                38
 05/13/2021   17:31:20   ( -69.69,  96.83) 05/13/2021   17:32:05  ( -69.69,  96.78)    1.80                45
 05/13/2021   18:22:04   (  69.58, -95.70) 05/13/2021   18:21:32  (  69.58, -95.72)    0.67                32
 05/16/2021   09:47:40   ( -69.72,-147.29) 05/16/2021   09:48:31  ( -69.71,-147.31)    2.16                51
 05/16/2021   10:38:24   (  69.62,  20.18) 05/16/2021   10:37:58  (  69.59,  20.18)    2.53                26
 05/16/2021   11:28:49   ( -68.66,-171.16) 05/16/2021   11:27:42  ( -68.71,-173.33)   87.68                67
 05/19/2021   02:04:00   ( -69.76, -31.41) 05/19/2021   02:04:56  ( -69.77, -31.34)    2.91                56
 05/19/2021   02:54:43   (  69.60, 136.14) 05/19/2021   02:54:24  (  69.60, 136.07)    2.52                19
 05/19/2021   03:45:13   ( -68.92, -55.57) 05/19/2021   03:44:04  ( -68.95, -57.15)   63.49                69
 05/21/2021   18:20:18   ( -69.75,  84.55) 05/21/2021   18:21:21  ( -69.78,  84.55)    3.49                63
 05/21/2021   19:11:02   (  69.64,-107.99) 05/21/2021   19:10:48  (  69.66,-107.96)    2.13                14
 05/21/2021   20:01:36   ( -69.17,  60.02) 05/21/2021   20:00:24  ( -69.23,  59.09)   37.11                72