Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2019 5 11.  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)
 05/13/2019   00:33:46   (  68.90, 170.69) 05/13/2019   00:34:48  (  68.92, 170.75)    3.28                62
 05/13/2019   01:24:26   ( -68.76, -21.79) 05/13/2019   01:24:19  ( -68.75, -21.83)    1.57                 7
 05/13/2019   02:15:03   (  68.25, 146.18) 05/13/2019   02:13:52  (  68.31, 145.28)   37.63                71
 05/15/2019   16:50:13   (  68.88, -73.39) 05/15/2019   16:51:18  (  68.86, -73.45)    3.01                65
 05/15/2019   17:40:54   ( -68.78,  94.06) 05/15/2019   17:40:47  ( -68.80,  94.11)    3.37                 7
 05/15/2019   18:31:31   (  68.28, -97.98) 05/15/2019   18:30:20  (  68.36, -98.79)   34.59                71
 05/18/2019   09:06:41   (  68.90,  42.45) 05/18/2019   09:07:46  (  68.90,  42.48)    1.33                65
 05/18/2019   09:57:21   ( -68.75,-150.02) 05/18/2019   09:57:17  ( -68.74,-150.09)    3.01                 4
 05/18/2019   10:48:00   (  68.36,  17.80) 05/18/2019   10:46:48  (  68.40,  17.15)   27.39                72
 05/21/2019   01:23:07   (  68.88, 158.37) 05/21/2019   01:24:14  (  68.89, 158.34)    1.37                67
 05/21/2019   02:13:48   ( -68.77, -34.17) 05/21/2019   02:13:44  ( -68.78, -34.16)    1.10                 4
 05/21/2019   03:04:27   (  68.38, 133.65) 05/21/2019   03:03:15  (  68.44, 133.07)   24.41                72
 05/23/2019   17:39:35   (  68.91, -85.79) 05/23/2019   17:40:42  (  68.92, -85.73)    2.82                67
 05/23/2019   18:30:15   ( -68.74,  81.75) 05/23/2019   18:30:13  ( -68.76,  81.70)    3.13                 2
 05/23/2019   19:20:55   (  68.41,-110.51) 05/23/2019   19:19:43  (  68.48,-111.00)   21.58                72