Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 9 15.  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)
 09/16/2021   17:40:53   ( -70.38,  94.35) 09/16/2021   17:42:05  ( -70.35,  94.62)   10.81                72
 09/16/2021   18:31:35   (  70.17, -98.02) 09/16/2021   18:31:33  (  70.19, -97.97)    2.48                 2
 09/16/2021   19:22:16   ( -70.07,  69.46) 09/16/2021   19:21:03  ( -70.08,  69.50)    1.56                73
 09/19/2021   09:57:17   ( -70.70,-150.22) 09/19/2021   09:58:27  ( -70.60,-149.14)   41.67                70
 09/19/2021   10:47:53   (  70.18,  17.92) 09/19/2021   10:48:00  (  70.16,  17.87)    2.76                 7
 09/19/2021   11:38:34   ( -70.08,-174.60) 09/19/2021   11:37:29  ( -70.11,-174.57)    3.26                65
 09/22/2021   02:13:39   ( -70.97, -34.73) 09/22/2021   02:14:47  ( -70.90, -32.81)   70.14                68
 09/22/2021   03:04:10   (  70.19, 133.86) 09/22/2021   03:04:25  (  70.19, 133.78)    2.78                15
 09/22/2021   03:54:51   ( -70.09, -58.66) 09/22/2021   03:53:55  ( -70.08, -58.74)    2.85                56
 09/24/2021   19:20:29   (  70.25,-110.30) 09/24/2021   19:20:50  (  70.26,-110.23)    2.52                21
 09/24/2021   20:11:10   ( -70.15,  57.19) 09/24/2021   20:10:20  ( -70.16,  57.25)    2.56                50
 09/27/2021   11:36:47   (  70.26,   5.63) 09/27/2021   11:37:16  (  70.27,   5.67)    1.74                29
 09/27/2021   12:27:28   ( -70.16, 173.12) 09/27/2021   12:26:46  ( -70.17, 173.15)    2.06                42