Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 4 5.  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   04:01:37   ( -70.54, -62.24) 04/06/2021   04:02:43  ( -70.47, -59.68)   95.25                66
 04/06/2021   04:52:03   (  69.53, 106.63) 04/06/2021   04:52:25  (  69.54, 106.66)    2.17                22
 04/06/2021   05:42:45   ( -69.44, -85.92) 04/06/2021   05:41:55  ( -69.43, -85.86)    2.72                50
 04/08/2021   21:08:23   (  69.53,-137.45) 04/08/2021   21:08:53  (  69.52,-137.49)    1.92                30
 04/08/2021   21:59:05   ( -69.44,  30.00) 04/08/2021   21:58:23  ( -69.41,  30.00)    3.28                42
 04/11/2021   13:24:43   (  69.54, -21.53) 04/11/2021   13:25:20  (  69.56, -21.57)    2.28                37
 04/11/2021   14:15:25   ( -69.45, 145.93) 04/11/2021   14:14:50  ( -69.45, 145.92)    0.30                35
 04/14/2021   05:41:03   (  69.61,  94.32) 04/14/2021   05:41:46  (  69.58,  94.35)    2.70                43
 04/14/2021   06:31:44   ( -69.46, -98.15) 04/14/2021   06:31:16  ( -69.48, -98.16)    2.05                28
 04/16/2021   21:57:23   (  69.62,-149.77) 04/16/2021   21:58:13  (  69.61,-149.75)    1.46                50
 04/16/2021   22:48:05   ( -69.53,  17.69) 04/16/2021   22:47:43  ( -69.50,  17.75)    3.42                22
 04/16/2021   23:38:32   (  68.55,-173.65) 04/16/2021   23:37:25  (  68.55,-175.82)   88.33                67