Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 4 4.  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   04:01:38   ( -70.57, -62.28) 04/06/2021   04:02:44  ( -70.44, -59.73)   96.03                66
 04/06/2021   04:52:03   (  69.50, 106.66) 04/06/2021   04:52:26  (  69.51, 106.62)    1.88                23
 04/06/2021   05:42:45   ( -69.41, -85.89) 04/06/2021   05:41:56  ( -69.40, -85.90)    1.66                49
 04/08/2021   21:08:23   (  69.56,-137.49) 04/08/2021   21:08:52  (  69.55,-137.46)    2.34                29
 04/08/2021   21:59:04   ( -69.42,  30.04) 04/08/2021   21:58:22  ( -69.44,  30.03)    2.12                42
 04/11/2021   13:24:43   (  69.57, -21.57) 04/11/2021   13:25:19  (  69.58, -21.54)    1.47                36
 04/11/2021   14:15:25   ( -69.48, 145.88) 04/11/2021   14:14:49  ( -69.47, 145.95)    2.87                36
 04/14/2021   05:41:03   (  69.59,  94.35) 04/14/2021   05:41:46  (  69.61,  94.38)    2.59                43
 04/14/2021   06:31:45   ( -69.49, -98.20) 04/14/2021   06:31:16  ( -69.50, -98.13)    2.88                29
 04/16/2021   21:57:23   (  69.60,-149.74) 04/16/2021   21:58:13  (  69.63,-149.72)    3.42                50
 04/16/2021   22:48:05   ( -69.51,  17.72) 04/16/2021   22:47:43  ( -69.53,  17.78)    3.41                22
 04/16/2021   23:38:32   (  68.53,-173.62) 04/16/2021   23:37:25  (  68.58,-175.79)   88.37                67