Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 5 19.  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)
 05/19/2021   02:54:43   (  69.64, 136.08) 05/19/2021   02:54:22  (  69.66, 136.15)    3.47                21
 05/19/2021   03:45:12   ( -68.91, -55.56) 05/19/2021   03:44:03  ( -68.94, -57.16)   64.14                69
 05/21/2021   18:20:18   ( -69.74,  84.56) 05/21/2021   18:21:21  ( -69.77,  84.54)    3.19                63
 05/21/2021   19:11:03   (  69.68,-108.04) 05/21/2021   19:10:48  (  69.66,-107.97)    3.38                15
 05/21/2021   20:01:36   ( -69.16,  60.03) 05/21/2021   20:00:24  ( -69.22,  59.08)   38.19                72
 05/24/2021   10:36:38   ( -69.78,-159.55) 05/24/2021   10:37:47  ( -69.77,-159.58)    1.70                69
 05/24/2021   11:27:22   (  69.66,   7.92) 05/24/2021   11:27:14  (  69.65,   7.91)    1.20                 8
 05/24/2021   12:17:59   ( -69.36, 175.69) 05/24/2021   12:16:46  ( -69.44, 175.25)   19.48                73
 05/27/2021   02:53:00   ( -69.92, -43.83) 05/27/2021   02:54:11  ( -69.87, -43.56)   11.76                71
 05/27/2021   03:43:42   (  69.70, 123.80) 05/27/2021   03:43:39  (  69.70, 123.85)    1.91                 3
 05/27/2021   04:34:22   ( -69.55, -68.65) 05/27/2021   04:33:10  ( -69.54, -68.73)    3.48                72
 05/29/2021   19:09:22   ( -70.12,  71.81) 05/29/2021   19:10:33  ( -70.02,  72.53)   29.50                71
 05/29/2021   20:00:00   (  69.69,-120.24) 05/29/2021   20:00:04  (  69.68,-120.29)    2.25                 4
 05/29/2021   20:50:41   ( -69.59,  47.23) 05/29/2021   20:49:34  ( -69.58,  47.21)    1.60                67
 06/01/2021   11:25:45   ( -70.31,-172.56) 06/01/2021   11:26:55  ( -70.22,-171.30)   48.48                70
 06/01/2021   12:16:20   (  69.74,  -4.36) 06/01/2021   12:16:29  (  69.71,  -4.36)    2.36                 9
 06/01/2021   13:07:01   ( -69.63, 163.11) 06/01/2021   13:05:59  ( -69.62, 163.14)    2.14                62