Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 3 6.  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)
 03/07/2021   17:01:38   ( -69.41, 104.22) 03/07/2021   17:02:07  ( -69.44, 104.21)    3.18                29
 03/07/2021   17:52:22   (  69.33, -88.35) 03/07/2021   17:51:34  (  69.33, -88.28)    2.73                48
 03/10/2021   09:17:58   ( -69.44,-139.90) 03/10/2021   09:18:33  ( -69.46,-139.88)    1.87                35
 03/10/2021   10:08:41   (  69.31,  27.60) 03/10/2021   10:08:01  (  69.29,  27.54)    3.31                40
 03/13/2021   01:34:19   ( -69.48, -24.01) 03/13/2021   01:35:00  ( -69.47, -23.98)    1.27                41
 03/13/2021   02:25:02   (  69.35, 143.47) 03/13/2021   02:24:27  (  69.36, 143.51)    1.58                35
 03/15/2021   17:50:39   ( -69.46,  91.94) 03/15/2021   17:51:27  ( -69.48,  91.91)    2.90                48
 03/15/2021   18:41:22   (  69.34,-100.58) 03/15/2021   18:40:54  (  69.36,-100.60)    2.60                28
 03/15/2021   19:31:47   ( -68.34,  68.10) 03/15/2021   19:30:40  ( -68.38,  65.79)   95.16                67
 03/18/2021   10:07:00   ( -69.50,-152.18) 03/18/2021   10:07:54  ( -69.49,-152.20)    1.45                54
 03/18/2021   10:57:43   (  69.39,  15.29) 03/18/2021   10:57:21  (  69.37,  15.28)    2.14                22
 03/18/2021   11:48:11   ( -68.54,-176.22) 03/18/2021   11:47:03  ( -68.60,-178.06)   74.84                68