Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 3 10.  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)
 03/10/2021   09:17:58   ( -69.44,-139.90) 03/10/2021   09:18:33  ( -69.47,-139.87)    2.85                35
 03/10/2021   10:08:41   (  69.31,  27.61) 03/10/2021   10:08:01  (  69.30,  27.56)    1.88                40
 03/13/2021   01:34:19   ( -69.48, -24.02) 03/13/2021   01:35:00  ( -69.48, -23.97)    1.80                41
 03/13/2021   02:25:02   (  69.35, 143.48) 03/13/2021   02:24:27  (  69.37, 143.53)    3.05                35
 03/15/2021   17:50:39   ( -69.47,  91.93) 03/15/2021   17:51:27  ( -69.49,  91.92)    3.04                48
 03/15/2021   18:41:23   (  69.40,-100.66) 03/15/2021   18:40:54  (  69.38,-100.58)    3.56                29
 03/15/2021   19:31:47   ( -68.35,  68.10) 03/15/2021   19:30:40  ( -68.39,  65.80)   94.33                67
 03/18/2021   10:06:59   ( -69.51,-152.19) 03/18/2021   10:07:53  ( -69.50,-152.19)    1.00                54
 03/18/2021   10:57:42   (  69.39,  15.28) 03/18/2021   10:57:20  (  69.38,  15.30)    1.28                22
 03/18/2021   11:48:10   ( -68.55,-176.24) 03/18/2021   11:47:02  ( -68.62,-178.04)   73.65                68
 03/21/2021   02:23:19   ( -69.50, -36.25) 03/21/2021   02:24:20  ( -69.50, -36.31)    2.14                61
 03/21/2021   03:14:02   (  69.39, 131.22) 03/21/2021   03:13:47  (  69.38, 131.18)    1.65                15
 03/21/2021   04:04:35   ( -68.81, -60.65) 03/21/2021   04:03:24  ( -68.90, -61.81)   47.56                71
 03/23/2021   18:39:40   ( -69.55,  79.61) 03/23/2021   18:40:46  ( -69.55,  79.65)    1.43                66
 03/23/2021   19:30:23   (  69.44,-112.92) 03/23/2021   19:30:13  (  69.43,-112.87)    2.20                10
 03/23/2021   20:20:59   ( -69.02,  55.00) 03/23/2021   20:19:47  ( -69.11,  54.34)   27.94                72