Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2020 12 13.  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)
 12/14/2020   14:02:44   (  69.19, -31.21) 12/14/2020   14:03:37  (  69.22, -31.21)    3.09                53
 12/14/2020   14:53:26   ( -69.11, 136.23) 12/14/2020   14:53:07  ( -69.11, 136.27)    1.91                19
 12/14/2020   15:43:55   (  68.23, -55.28) 12/14/2020   15:42:47  (  68.28, -57.12)   75.83                68
 12/17/2020   06:19:06   (  69.23,  84.66) 12/17/2020   06:20:04  (  69.23,  84.68)    0.73                58
 12/17/2020   07:09:47   ( -69.10,-107.83) 12/17/2020   07:09:34  ( -69.12,-107.83)    2.08                13
 12/17/2020   08:00:20   (  68.43,  60.39) 12/17/2020   07:59:10  (  68.51,  59.05)   55.32                70
 12/19/2020   22:35:27   (  69.22,-159.39) 12/19/2020   22:36:31  (  69.23,-159.44)    1.87                64
 12/19/2020   23:26:09   ( -69.14,   8.04) 12/19/2020   23:26:01  ( -69.12,   8.06)    2.37                 8
 12/20/2020   00:16:45   (  68.63, 176.04) 12/20/2020   00:15:34  (  68.68, 175.14)   36.92                71
 12/22/2020   14:51:48   (  69.27, -43.53) 12/22/2020   14:52:56  (  69.28, -43.49)    2.37                68
 12/22/2020   15:42:29   ( -69.13, 123.97) 12/22/2020   15:42:27  ( -69.12, 123.94)    2.20                 2
 12/22/2020   16:33:09   (  68.84, -68.31) 12/22/2020   16:31:56  (  68.89, -68.71)   16.93                73
 12/25/2020   07:08:11   (  69.37,  72.25) 12/25/2020   07:09:22  (  69.32,  72.46)    9.57                71
 12/25/2020   07:58:51   ( -69.18,-120.17) 12/25/2020   07:58:53  ( -69.17,-120.12)    2.98                 2
 12/25/2020   08:49:33   (  68.99,  47.40) 12/25/2020   08:48:21  (  68.99,  47.31)    3.86                72