Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 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)
 12/03/2021   06:20:08   ( -70.58, -95.14) 12/03/2021   06:20:34  ( -70.60, -95.11)    2.12                26
 12/03/2021   07:10:53   (  70.46,  72.37) 12/03/2021   07:10:02  (  70.45,  72.32)    2.22                51
 12/05/2021   20:56:47   ( -71.32,  44.53) 12/05/2021   20:57:55  ( -71.19,  46.41)   68.55                68
 12/05/2021   21:47:20   (  70.58,-146.91) 12/05/2021   21:47:32  (  70.55,-146.93)    3.19                12
 12/05/2021   22:38:02   ( -70.46,  20.59) 12/05/2021   22:37:01  ( -70.48,  20.61)    2.82                61
 12/08/2021   12:23:49   (  70.80,  -6.37) 12/08/2021   12:25:00  (  70.75,  -6.02)   14.07                71
 12/08/2021   13:14:29   ( -70.57, 161.32) 12/08/2021   13:14:31  ( -70.58, 161.35)    1.41                 2
 12/08/2021   14:05:12   (  70.36, -31.03) 12/08/2021   14:03:59  (  70.42, -31.24)   10.45                73
 12/11/2021   03:50:56   ( -70.69, -57.96) 12/11/2021   03:52:01  ( -70.67, -57.91)    3.03                65
 12/11/2021   04:41:39   (  70.54, 109.60) 12/11/2021   04:41:27  (  70.56, 109.58)    2.84                12
 12/11/2021   05:32:14   ( -70.04, -82.30) 12/11/2021   05:31:03  ( -70.12, -83.43)   43.91                71
 12/13/2021   19:18:06   (  70.67,-109.70) 12/13/2021   19:18:57  (  70.64,-109.70)    3.09                51
 12/13/2021   20:08:48   ( -70.53,  57.84) 12/13/2021   20:08:27  ( -70.53,  57.77)    2.84                21
 12/16/2021   10:45:15   ( -70.66,-161.45) 12/16/2021   10:45:56  ( -70.66,-161.43)    0.73                41
 12/16/2021   11:36:00   (  70.57,   6.00) 12/16/2021   11:35:23  (  70.55,   6.04)    3.03                37