Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 10 7.  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)
 10/08/2021   04:41:58   (  70.36, 109.28) 10/08/2021   04:42:57  (  70.35, 109.28)    1.21                59
 10/08/2021   05:32:38   ( -70.22, -83.18) 10/08/2021   05:32:27  ( -70.23, -83.25)    3.21                11
 10/08/2021   06:23:12   (  69.57,  85.11) 10/08/2021   06:22:03  (  69.63,  83.56)   60.58                69
 10/10/2021   20:58:16   (  70.39,-134.82) 10/10/2021   20:59:22  (  70.38,-134.79)    1.27                66
 10/10/2021   21:48:57   ( -70.29,  32.65) 10/10/2021   21:48:52  ( -70.27,  32.68)    3.20                 5
 10/10/2021   22:39:35   (  69.86,-159.38) 10/10/2021   22:38:23  (  69.94,-160.14)   30.41                72
 10/13/2021   13:14:35   (  70.47, -19.00) 10/13/2021   13:15:46  (  70.45, -18.80)    7.60                71
 10/13/2021   14:05:15   ( -70.32, 148.56) 10/13/2021   14:05:17  ( -70.29, 148.60)    3.26                 2
 10/13/2021   14:55:56   (  70.10, -43.80) 10/13/2021   14:54:44  (  70.12, -44.00)    7.92                72
 10/16/2021   05:30:56   (  70.71,  96.56) 10/16/2021   05:32:07  (  70.63,  97.35)   30.42                71
 10/16/2021   06:21:31   ( -70.29, -95.45) 10/16/2021   06:21:41  ( -70.31, -95.50)    2.51                10
 10/16/2021   07:12:15   (  70.19,  72.02) 10/16/2021   07:11:08  (  70.19,  71.98)    1.45                67
 10/18/2021   21:47:19   (  71.01,-147.99) 10/18/2021   21:48:27  (  70.92,-146.34)   60.74                68
 10/18/2021   22:37:49   ( -70.32,  20.45) 10/18/2021   22:38:06  ( -70.32,  20.40)    1.92                17
 10/18/2021   23:28:33   (  70.23,-172.09) 10/18/2021   23:27:33  (  70.20,-172.12)    2.86                60