Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 7 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)
 07/19/2021   18:00:42   ( -70.01,  89.51) 07/19/2021   18:01:43  ( -69.99,  89.50)    1.39                61
 07/19/2021   18:51:25   (  69.89,-103.00) 07/19/2021   18:51:10  (  69.89,-103.00)    0.18                15
 07/19/2021   19:41:58   ( -69.32,  65.15) 07/19/2021   19:40:47  ( -69.39,  63.96)   47.24                71
 07/22/2021   10:17:01   ( -70.03,-154.58) 07/22/2021   10:18:08  ( -70.03,-154.56)    0.91                67
 07/22/2021   11:07:43   (  69.91,  12.90) 07/22/2021   11:07:34  (  69.92,  12.93)    1.50                 9
 07/22/2021   11:58:20   ( -69.56,-179.25) 07/22/2021   11:57:08  ( -69.59,-179.89)   25.21                72
 07/25/2021   02:33:20   ( -70.10, -38.76) 07/25/2021   02:34:32  ( -70.06, -38.63)    6.45                72
 07/25/2021   03:24:02   (  69.94, 128.80) 07/25/2021   03:23:59  (  69.95, 128.86)    2.43                 3
 07/25/2021   04:14:43   ( -69.79, -63.65) 07/25/2021   04:13:30  ( -69.79, -63.73)    3.21                73
 07/27/2021   18:49:43   ( -70.34,  76.82) 07/27/2021   18:50:55  ( -70.20,  77.45)   28.15                72
 07/27/2021   19:40:20   (  69.92,-115.22) 07/27/2021   19:40:25  (  69.92,-115.30)    3.03                 5
 07/27/2021   20:31:02   ( -69.82,  52.25) 07/27/2021   20:29:55  ( -69.82,  52.19)    2.44                67
 07/30/2021   11:06:06   ( -70.58,-167.62) 07/30/2021   11:07:16  ( -70.45,-166.31)   50.63                70
 07/30/2021   11:56:39   (  69.95,   0.68) 07/30/2021   11:56:50  (  69.95,   0.62)    2.22                11
 07/30/2021   12:47:21   ( -69.85, 168.15) 07/30/2021   12:46:20  ( -69.84, 168.11)    1.74                61