Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 4 6.  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)
 04/06/2021   04:52:03   (  69.50, 106.66) 04/06/2021   04:52:26  (  69.51, 106.62)    2.03                23
 04/06/2021   05:42:45   ( -69.41, -85.89) 04/06/2021   05:41:56  ( -69.39, -85.90)    2.10                49
 04/08/2021   21:08:23   (  69.56,-137.49) 04/08/2021   21:08:52  (  69.55,-137.46)    1.91                29
 04/08/2021   21:59:04   ( -69.42,  30.04) 04/08/2021   21:58:22  ( -69.44,  30.03)    1.92                42
 04/11/2021   13:24:43   (  69.57, -21.56) 04/11/2021   13:25:19  (  69.58, -21.54)    1.72                36
 04/11/2021   14:15:25   ( -69.48, 145.89) 04/11/2021   14:14:49  ( -69.47, 145.95)    2.64                36
 04/14/2021   05:41:03   (  69.58,  94.36) 04/14/2021   05:41:47  (  69.55,  94.30)    3.46                44
 04/14/2021   06:31:45   ( -69.49, -98.19) 04/14/2021   06:31:16  ( -69.50, -98.13)    2.84                29
 04/16/2021   21:57:23   (  69.59,-149.72) 04/16/2021   21:58:14  (  69.58,-149.79)    2.89                51
 04/16/2021   22:48:05   ( -69.50,  17.73) 04/16/2021   22:47:44  ( -69.47,  17.71)    2.88                21
 04/16/2021   23:38:32   (  68.52,-173.61) 04/16/2021   23:37:25  (  68.58,-175.79)   89.02                67
 04/19/2021   14:13:43   (  69.65, -33.88) 04/19/2021   14:14:39  (  69.65, -33.81)    2.73                56
 04/19/2021   15:04:24   ( -69.51, 133.65) 04/19/2021   15:04:10  ( -69.49, 133.61)    2.23                14
 04/19/2021   15:54:56   (  68.80, -58.05) 04/19/2021   15:53:47  (  68.82, -59.61)   63.03                69