Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 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)
 12/21/2021   16:49:06   (  71.43, -73.64) 12/21/2021   16:50:13  (  71.36, -71.51)   76.14                67
 12/21/2021   17:39:36   ( -70.66,  94.99) 12/21/2021   17:39:54  ( -70.64,  95.01)    1.84                18
 12/21/2021   18:30:20   (  70.52, -97.47) 12/21/2021   18:29:21  (  70.54, -97.50)    2.97                59
 12/24/2021   08:16:09   ( -71.09,-124.82) 12/24/2021   08:17:20  ( -70.99,-123.87)   36.17                71
 12/24/2021   09:06:47   (  70.65,  43.23) 12/24/2021   09:06:51  (  70.67,  43.29)    2.93                 4
 12/24/2021   09:57:30   ( -70.54,-149.29) 12/24/2021   09:56:21  ( -70.55,-149.25)    1.31                69
 12/26/2021   23:43:13   (  70.73,-175.98) 12/26/2021   23:44:22  (  70.72,-176.02)    1.68                69
 12/27/2021   00:33:56   ( -70.62,  -8.49) 12/27/2021   00:33:52  ( -70.61,  -8.56)    2.88                 4
 12/27/2021   01:24:34   (  70.23, 159.44) 12/27/2021   01:23:22  (  70.28, 158.61)   32.10                72
 12/29/2021   15:10:22   ( -70.74, 132.23) 12/29/2021   15:11:21  ( -70.71, 132.20)    3.11                59
 12/29/2021   16:01:06   (  70.62, -60.27) 12/29/2021   16:00:48  (  70.60, -60.32)    2.62                18
 12/29/2021   16:51:37   ( -69.88, 108.21) 12/29/2021   16:50:28  ( -69.95, 106.36)   70.99                69
 01/01/2022   06:37:33   (  70.76,  80.43) 01/01/2022   06:38:17  (  70.75,  80.50)    2.82                44
 01/01/2022   07:28:16   ( -70.63,-112.06) 01/01/2022   07:27:47  ( -70.64,-112.03)    1.59                29
 01/03/2022   22:04:42   ( -70.71,  28.73) 01/03/2022   22:05:17  ( -70.72,  28.70)    1.94                35
 01/03/2022   22:55:26   (  70.60,-163.79) 01/03/2022   22:54:44  (  70.61,-163.83)    1.72                42