Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 17.  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   (  70.63, 146.82) 12/19/2021   02:12:54  (  70.62, 146.75)    2.58                28
 12/19/2021   03:03:09   ( -70.53, -45.72) 12/19/2021   03:02:23  ( -70.56, -45.72)    2.65                46
 12/21/2021   16:49:06   (  71.43, -73.65) 12/21/2021   16:50:13  (  71.35, -71.52)   75.92                67
 12/21/2021   17:39:36   ( -70.66,  95.00) 12/21/2021   17:39:54  ( -70.63,  95.00)    2.41                18
 12/21/2021   18:30:20   (  70.52, -97.48) 12/21/2021   18:29:21  (  70.53, -97.51)    1.73                59
 12/24/2021   08:16:09   ( -71.09,-124.82) 12/24/2021   08:17:20  ( -70.97,-123.89)   36.28                71
 12/24/2021   09:06:47   (  70.65,  43.22) 12/24/2021   09:06:51  (  70.65,  43.26)    1.62                 4
 12/24/2021   09:57:30   ( -70.55,-149.29) 12/24/2021   09:56:21  ( -70.53,-149.27)    1.62                69
 12/26/2021   23:43:13   (  70.74,-176.00) 12/26/2021   23:44:21  (  70.75,-175.98)    1.23                68
 12/27/2021   00:33:55   ( -70.62,  -8.50) 12/27/2021   00:33:50  ( -70.64,  -8.52)    1.77                 5
 12/27/2021   01:24:33   (  70.19, 159.51) 12/27/2021   01:23:22  (  70.25, 158.56)   36.32                71
 12/29/2021   15:10:22   ( -70.75, 132.21) 12/29/2021   15:11:20  ( -70.73, 132.22)    2.98                58
 12/29/2021   16:01:06   (  70.64, -60.30) 12/29/2021   16:00:47  (  70.61, -60.30)    2.80                19