Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 4 3.  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)
 04/03/2021   11:45:12   ( -70.27,-177.74) 04/03/2021   11:46:21  ( -70.15,-176.02)   66.35                69
 04/03/2021   12:35:43   (  69.52,  -9.30) 04/03/2021   12:35:58  (  69.50,  -9.27)    2.48                15
 04/03/2021   13:26:24   ( -69.37, 158.23) 04/03/2021   13:25:28  ( -69.38, 158.21)    1.30                56
 04/06/2021   04:01:37   ( -70.53, -62.23) 04/06/2021   04:02:43  ( -70.47, -59.68)   95.01                66
 04/06/2021   04:52:03   (  69.52, 106.63) 04/06/2021   04:52:25  (  69.54, 106.66)    2.29                22
 04/06/2021   05:42:45   ( -69.43, -85.92) 04/06/2021   05:41:55  ( -69.43, -85.86)    2.38                50
 04/08/2021   21:08:23   (  69.53,-137.44) 04/08/2021   21:08:53  (  69.53,-137.49)    1.67                30
 04/08/2021   21:59:05   ( -69.44,  30.01) 04/08/2021   21:58:23  ( -69.42,  30.00)    2.07                42
 04/11/2021   13:24:43   (  69.54, -21.52) 04/11/2021   13:25:20  (  69.56, -21.56)    3.07                37
 04/11/2021   14:15:25   ( -69.44, 145.94) 04/11/2021   14:14:50  ( -69.46, 145.93)    1.51                35
 04/14/2021   05:41:03   (  69.60,  94.32) 04/14/2021   05:41:46  (  69.59,  94.36)    1.53                43
 04/14/2021   06:31:45   ( -69.50, -98.22) 04/14/2021   06:31:16  ( -69.49, -98.15)    3.19                29
 04/16/2021   21:57:23   (  69.61,-149.76) 04/16/2021   21:58:13  (  69.62,-149.72)    1.85                50
 04/16/2021   22:48:05   ( -69.52,  17.70) 04/16/2021   22:47:43  ( -69.52,  17.77)    2.88                22
 04/16/2021   23:38:32   (  68.55,-173.64) 04/16/2021   23:37:25  (  68.57,-175.80)   87.94                67