Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 9 13.  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)
 09/14/2021   01:24:33   ( -70.27, -21.43) 09/14/2021   01:25:40  ( -70.26, -21.39)    2.22                67
 09/14/2021   02:15:17   (  70.17, 146.04) 09/14/2021   02:15:07  (  70.16, 146.11)    2.98                10
 09/14/2021   03:05:53   ( -69.81, -46.08) 09/14/2021   03:04:40  ( -69.88, -46.65)   23.44                73
 09/16/2021   17:40:53   ( -70.38,  94.35) 09/16/2021   17:42:05  ( -70.35,  94.62)   10.83                72
 09/16/2021   18:31:35   (  70.18, -98.02) 09/16/2021   18:31:33  (  70.19, -97.97)    2.27                 2
 09/16/2021   19:22:16   ( -70.07,  69.46) 09/16/2021   19:21:03  ( -70.08,  69.51)    1.64                73
 09/19/2021   09:57:17   ( -70.70,-150.23) 09/19/2021   09:58:27  ( -70.60,-149.14)   41.72                70
 09/19/2021   10:47:53   (  70.18,  17.92) 09/19/2021   10:48:00  (  70.16,  17.87)    3.11                 7
 09/19/2021   11:38:34   ( -70.08,-174.60) 09/19/2021   11:37:29  ( -70.11,-174.57)    3.23                65
 09/22/2021   02:13:39   ( -70.97, -34.73) 09/22/2021   02:14:47  ( -70.90, -32.81)   70.17                68
 09/22/2021   03:04:10   (  70.19, 133.85) 09/22/2021   03:04:25  (  70.18, 133.78)    2.96                15
 09/22/2021   03:54:51   ( -70.09, -58.67) 09/22/2021   03:53:55  ( -70.08, -58.74)    2.94                56
 09/24/2021   19:20:29   (  70.25,-110.30) 09/24/2021   19:20:50  (  70.25,-110.24)    2.26                21
 09/24/2021   20:11:10   ( -70.15,  57.18) 09/24/2021   20:10:20  ( -70.15,  57.25)    2.39                50