Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 5 21.  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)
 05/21/2021   18:20:18   ( -69.75,  84.55) 05/21/2021   18:21:21  ( -69.77,  84.53)    1.83                63
 05/21/2021   19:11:02   (  69.63,-107.97) 05/21/2021   19:10:48  (  69.66,-107.96)    3.18                14
 05/21/2021   20:01:35   ( -69.12,  60.09) 05/21/2021   20:00:24  ( -69.21,  59.08)   41.69                71
 05/24/2021   10:36:38   ( -69.79,-159.58) 05/24/2021   10:37:47  ( -69.76,-159.59)    3.49                69
 05/24/2021   11:27:22   (  69.68,   7.90) 05/24/2021   11:27:14  (  69.65,   7.91)    2.72                 8
 05/24/2021   12:17:59   ( -69.37, 175.67) 05/24/2021   12:16:46  ( -69.43, 175.24)   17.90                73
 05/27/2021   02:52:59   ( -69.89, -43.79) 05/27/2021   02:54:11  ( -69.86, -43.57)    8.99                72
 05/27/2021   03:43:41   (  69.67, 123.85) 05/27/2021   03:43:39  (  69.70, 123.85)    2.34                 2
 05/27/2021   04:34:22   ( -69.58, -68.69) 05/27/2021   04:33:09  ( -69.59, -68.66)    1.34                73
 05/29/2021   19:09:22   ( -70.15,  71.76) 05/29/2021   19:10:33  ( -70.01,  72.52)   33.05                71
 05/29/2021   20:00:00   (  69.73,-120.29) 05/29/2021   20:00:03  (  69.73,-120.22)    2.65                 3
 05/29/2021   20:50:40   ( -69.58,  47.26) 05/29/2021   20:49:34  ( -69.57,  47.20)    2.35                66
 06/01/2021   11:25:45   ( -70.36,-172.63) 06/01/2021   11:26:54  ( -70.26,-171.23)   53.57                69
 06/01/2021   12:16:19   (  69.73,  -4.35) 06/01/2021   12:16:29  (  69.71,  -4.37)    2.94                10
 06/01/2021   13:07:00   ( -69.63, 163.12) 06/01/2021   13:05:59  ( -69.60, 163.12)    2.81                61