Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2020 12 15.  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)
 12/17/2020   06:19:06   (  69.24,  84.66) 12/17/2020   06:20:04  (  69.22,  84.67)    1.95                58
 12/17/2020   07:09:47   ( -69.11,-107.84) 12/17/2020   07:09:34  ( -69.11,-107.85)    0.14                13
 12/17/2020   08:00:20   (  68.44,  60.38) 12/17/2020   07:59:10  (  68.50,  59.04)   55.18                70
 12/19/2020   22:35:27   (  69.23,-159.40) 12/19/2020   22:36:31  (  69.22,-159.45)    1.81                64
 12/19/2020   23:26:08   ( -69.10,   8.10) 12/19/2020   23:26:01  ( -69.11,   8.04)    2.87                 7
 12/20/2020   00:16:45   (  68.64, 176.04) 12/20/2020   00:15:34  (  68.67, 175.13)   36.92                71
 12/22/2020   14:51:49   (  69.27, -43.54) 12/22/2020   14:52:57  (  69.27, -43.50)    1.65                68
 12/22/2020   15:42:30   ( -69.14, 123.96) 12/22/2020   15:42:27  ( -69.16, 124.00)    2.99                 3
 12/22/2020   16:33:09   (  68.84, -68.31) 12/22/2020   16:31:56  (  68.89, -68.72)   16.80                73
 12/25/2020   07:08:11   (  69.37,  72.25) 12/25/2020   07:09:22  (  69.32,  72.45)    9.83                71
 12/25/2020   07:58:50   ( -69.13,-120.10) 12/25/2020   07:58:53  ( -69.16,-120.13)    2.59                 3
 12/25/2020   08:49:33   (  69.00,  47.40) 12/25/2020   08:48:21  (  68.98,  47.29)    4.44                72
 12/27/2020   23:24:35   (  69.53,-172.05) 12/27/2020   23:25:46  (  69.46,-171.47)   23.60                71
 12/28/2020   00:15:12   ( -69.18,  -4.25) 12/28/2020   00:15:19  ( -69.19,  -4.19)    2.34                 7
 12/28/2020   01:05:55   (  69.05, 163.26) 12/28/2020   01:04:47  (  69.02, 163.23)    2.98                68