Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2020 12 18.  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)
 12/19/2020   22:35:27   (  69.24,-159.43) 12/19/2020   22:36:32  (  69.26,-159.40)    2.40                65
 12/19/2020   23:26:08   ( -69.12,   8.07) 12/19/2020   23:26:03  ( -69.10,   8.01)    3.32                 5
 12/20/2020   00:16:46   (  68.71, 175.94) 12/20/2020   00:15:34  (  68.77, 175.24)   28.96                72
 12/22/2020   14:51:49   (  69.28, -43.55) 12/22/2020   14:53:00  (  69.30, -43.48)    3.67                71
 12/22/2020   15:42:30   ( -69.15, 123.94) 12/22/2020   15:42:31  ( -69.14, 123.94)    2.16                 1
 12/22/2020   16:33:12   (  68.96, -68.48) 12/22/2020   16:31:59  (  68.97, -68.63)    6.09                73
 12/25/2020   07:08:15   (  69.53,  72.01) 12/25/2020   07:09:26  (  69.44,  72.58)   24.58                71
 12/25/2020   07:58:51   ( -69.14,-120.11) 12/25/2020   07:58:59  ( -69.17,-120.14)    3.10                 8
 12/25/2020   08:49:35   (  69.05,  47.32) 12/25/2020   08:48:26  (  69.05,  47.36)    1.50                69
 12/27/2020   23:24:41   (  69.78,-172.44) 12/27/2020   23:25:50  (  69.68,-171.21)   48.46                69
 12/28/2020   00:15:13   ( -69.18,  -4.24) 12/28/2020   00:15:27  ( -69.19,  -4.23)    0.98                14
 12/28/2020   01:05:56   (  69.09, 163.19) 12/28/2020   01:04:53  (  69.07, 163.26)    3.43                63
 12/30/2020   15:41:05   (  69.98, -56.81) 12/30/2020   15:42:13  (  69.91, -55.01)   69.01                68
 12/30/2020   16:31:34   ( -69.22, 111.62) 12/30/2020   16:31:54  ( -69.20, 111.66)    2.73                20
 12/30/2020   17:22:17   (  69.08, -80.87) 12/30/2020   17:21:21  (  69.09, -80.84)    1.23                56