Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 4 14.  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)
 04/14/2021   05:41:03   (  69.58,  94.35) 04/14/2021   05:41:47  (  69.56,  94.31)    2.58                44
 04/14/2021   06:31:45   ( -69.50, -98.20) 04/14/2021   06:31:16  ( -69.50, -98.14)    2.67                29
 04/16/2021   21:57:23   (  69.59,-149.73) 04/16/2021   21:58:14  (  69.58,-149.78)    2.30                51
 04/16/2021   22:48:05   ( -69.51,  17.71) 04/16/2021   22:47:43  ( -69.52,  17.77)    2.99                22
 04/16/2021   23:38:32   (  68.53,-173.61) 04/16/2021   23:37:25  (  68.59,-175.79)   88.57                67
 04/19/2021   14:13:42   (  69.61, -33.81) 04/19/2021   14:14:40  (  69.60, -33.88)    2.79                58
 04/19/2021   15:04:24   ( -69.52, 133.63) 04/19/2021   15:04:09  ( -69.54, 133.68)    3.12                15
 04/19/2021   15:54:56   (  68.81, -58.06) 04/19/2021   15:53:47  (  68.82, -59.61)   62.55                69
 04/22/2021   06:30:03   (  69.67,  82.02) 04/22/2021   06:31:06  (  69.67,  82.09)    2.61                63
 04/22/2021   07:20:44   ( -69.54,-110.46) 04/22/2021   07:20:36  ( -69.56,-110.43)    2.63                 8
 04/22/2021   08:11:20   (  69.04,  57.57) 04/22/2021   08:10:09  (  69.11,  56.63)   37.93                71
 04/24/2021   22:46:23   (  69.69,-162.07) 04/24/2021   22:47:33  (  69.67,-162.03)    2.62                70
 04/24/2021   23:37:04   ( -69.56,   5.45) 04/24/2021   23:37:03  ( -69.57,   5.46)    1.38                 1
 04/25/2021   00:27:45   (  69.32, 173.10) 04/25/2021   00:26:32  (  69.34, 172.81)   11.68                73
 04/27/2021   15:02:46   (  69.87, -46.40) 04/27/2021   15:03:58  (  69.78, -46.00)   18.04                72
 04/27/2021   15:53:24   ( -69.58, 121.36) 04/27/2021   15:53:30  ( -69.57, 121.35)    0.69                 6
 04/27/2021   16:44:06   (  69.45, -71.14) 04/27/2021   16:42:56  (  69.45, -71.16)    1.10                70