Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 9.  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)
 12/11/2021   03:50:56   ( -70.69, -57.95) 12/11/2021   03:52:01  ( -70.66, -57.93)    3.14                65
 12/11/2021   04:41:41   (  70.58, 109.53) 12/11/2021   04:41:28  (  70.56, 109.57)    2.82                13
 12/11/2021   05:32:15   ( -70.03, -82.29) 12/11/2021   05:31:04  ( -70.11, -83.45)   44.77                71
 12/13/2021   19:18:06   (  70.65,-109.68) 12/13/2021   19:18:57  (  70.64,-109.70)    1.51                51
 12/13/2021   20:08:49   ( -70.57,  57.78) 12/13/2021   20:08:26  ( -70.58,  57.84)    2.57                23
 12/16/2021   10:45:15   ( -70.63,-161.41) 12/16/2021   10:45:56  ( -70.66,-161.44)    3.20                41
 12/16/2021   11:36:00   (  70.54,   6.04) 12/16/2021   11:35:23  (  70.55,   6.05)    1.22                37
 12/19/2021   02:12:26   (  70.62, 146.83) 12/19/2021   02:12:53  (  70.63, 146.76)    2.54                27
 12/19/2021   03:03:09   ( -70.52, -45.70) 12/19/2021   03:02:23  ( -70.52, -45.77)    2.85                46
 12/21/2021   16:49:05   (  71.38, -73.55) 12/21/2021   16:50:13  (  71.24, -71.69)   68.04                68
 12/21/2021   17:39:36   ( -70.64,  95.02) 12/21/2021   17:39:52  ( -70.64,  95.02)    0.59                16
 12/21/2021   18:30:20   (  70.52, -97.47) 12/21/2021   18:29:19  (  70.53, -97.50)    1.56                61