Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 7 15.  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)
 07/17/2021   01:44:23   ( -69.98, -26.39) 07/17/2021   01:45:18  ( -69.96, -26.42)    2.26                55
 07/17/2021   02:35:06   (  69.86, 141.11) 07/17/2021   02:34:45  (  69.85, 141.07)    1.25                21
 07/17/2021   03:25:35   ( -69.08, -50.45) 07/17/2021   03:24:26  ( -69.13, -52.26)   71.84                69
 07/19/2021   18:00:42   ( -69.99,  89.53) 07/19/2021   18:01:43  ( -70.00,  89.52)    0.92                61
 07/19/2021   18:51:25   (  69.88,-102.99) 07/19/2021   18:51:10  (  69.89,-102.99)    1.33                15
 07/19/2021   19:41:58   ( -69.31,  65.17) 07/19/2021   19:40:48  ( -69.34,  63.90)   49.97                70
 07/22/2021   10:17:00   ( -70.01,-154.56) 07/22/2021   10:18:07  ( -70.04,-154.55)    2.77                67
 07/22/2021   11:07:43   (  69.91,  12.92) 07/22/2021   11:07:34  (  69.93,  12.94)    2.45                 9
 07/22/2021   11:58:20   ( -69.54,-179.23) 07/22/2021   11:57:08  ( -69.60,-179.88)   26.07                72
 07/25/2021   02:33:20   ( -70.09, -38.73) 07/25/2021   02:34:32  ( -70.07, -38.62)    4.55                72
 07/25/2021   03:24:02   (  69.93, 128.82) 07/25/2021   03:23:59  (  69.96, 128.86)    3.15                 3
 07/25/2021   04:14:43   ( -69.77, -63.63) 07/25/2021   04:13:30  ( -69.80, -63.73)    4.47                73
 07/27/2021   18:49:43   ( -70.32,  76.85) 07/27/2021   18:50:55  ( -70.21,  77.46)   26.04                72
 07/27/2021   19:40:21   (  69.96,-115.28) 07/27/2021   19:40:24  (  69.98,-115.22)    3.39                 3
 07/27/2021   20:31:03   ( -69.85,  52.20) 07/27/2021   20:29:55  ( -69.82,  52.20)    3.03                68