Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 18.  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)
 12/19/2021   02:12:26   (  70.62, 146.83) 12/19/2021   02:12:54  (  70.64, 146.77)    2.87                28
 12/19/2021   03:03:09   ( -70.53, -45.71) 12/19/2021   03:02:24  ( -70.51, -45.78)    3.04                45
 12/21/2021   16:49:06   (  71.43, -73.64) 12/21/2021   16:50:14  (  71.32, -71.57)   74.21                68
 12/21/2021   17:39:36   ( -70.65,  95.00) 12/21/2021   17:39:54  ( -70.66,  95.03)    1.07                18
 12/21/2021   18:30:21   (  70.57, -97.55) 12/21/2021   18:29:21  (  70.55, -97.48)    3.13                60
 12/24/2021   08:16:09   ( -71.09,-124.82) 12/24/2021   08:17:20  ( -71.01,-123.83)   36.66                71
 12/24/2021   09:06:47   (  70.65,  43.23) 12/24/2021   09:06:52  (  70.63,  43.24)    2.00                 5
 12/24/2021   09:57:30   ( -70.54,-149.28) 12/24/2021   09:56:22  ( -70.52,-149.30)    2.96                68
 12/26/2021   23:43:12   (  70.73,-175.99) 12/26/2021   23:44:21  (  70.76,-175.97)    2.62                69
 12/27/2021   00:33:55   ( -70.62,  -8.49) 12/27/2021   00:33:51  ( -70.65,  -8.51)    2.77                 4
 12/27/2021   01:24:34   (  70.24, 159.43) 12/27/2021   01:23:22  (  70.32, 158.66)   30.56                72
 12/29/2021   15:10:22   ( -70.75, 132.21) 12/29/2021   15:11:21  ( -70.77, 132.28)    2.98                59
 12/29/2021   16:01:06   (  70.64, -60.30) 12/29/2021   16:00:48  (  70.66, -60.25)    2.63                18