Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 7 14.  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   ( -69.97, -26.38) 07/17/2021   01:45:18  ( -69.97, -26.41)    1.35                55
 07/17/2021   02:35:06   (  69.85, 141.12) 07/17/2021   02:34:45  (  69.86, 141.08)    1.84                21
 07/17/2021   03:25:35   ( -69.07, -50.44) 07/17/2021   03:24:26  ( -69.14, -52.24)   71.94                69
 07/19/2021   18:00:42   ( -69.99,  89.54) 07/19/2021   18:01:43  ( -70.01,  89.53)    2.67                61
 07/19/2021   18:51:25   (  69.87,-102.98) 07/19/2021   18:51:10  (  69.90,-102.98)    3.09                15
 07/19/2021   19:41:58   ( -69.30,  65.18) 07/19/2021   19:40:48  ( -69.35,  63.91)   50.01                70
 07/22/2021   10:17:00   ( -70.01,-154.55) 07/22/2021   10:18:08  ( -69.99,-154.61)    2.70                68
 07/22/2021   11:07:43   (  69.90,  12.93) 07/22/2021   11:07:35  (  69.88,  12.88)    2.71                 8
 07/22/2021   11:58:20   ( -69.54,-179.22) 07/22/2021   11:57:08  ( -69.61,-179.86)   26.44                72
 07/25/2021   02:33:21   ( -70.13, -38.80) 07/25/2021   02:34:32  ( -70.08, -38.60)    9.29                71
 07/25/2021   03:24:02   (  69.92, 128.83) 07/25/2021   03:24:00  (  69.91, 128.80)    1.62                 2
 07/25/2021   04:14:43   ( -69.77, -63.62) 07/25/2021   04:13:30  ( -69.81, -63.71)    5.77                73
 07/27/2021   18:49:43   ( -70.31,  76.86) 07/27/2021   18:50:55  ( -70.22,  77.48)   25.32                72
 07/27/2021   19:40:21   (  69.95,-115.27) 07/27/2021   19:40:25  (  69.94,-115.27)    1.11                 4
 07/27/2021   20:31:03   ( -69.84,  52.21) 07/27/2021   20:29:55  ( -69.84,  52.22)    0.48                68