Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 12 12.  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)
 12/13/2021   19:18:07   (  70.68,-109.72) 12/13/2021   19:18:57  (  70.67,-109.67)    1.97                50
 12/13/2021   20:08:49   ( -70.54,  57.82) 12/13/2021   20:08:27  ( -70.55,  57.79)    1.45                22
 12/16/2021   10:45:16   ( -70.66,-161.45) 12/16/2021   10:45:57  ( -70.63,-161.49)    3.11                41
 12/16/2021   11:36:00   (  70.51,   6.09) 12/16/2021   11:35:24  (  70.53,   6.01)    3.45                36
 12/19/2021   02:12:26   (  70.64, 146.80) 12/19/2021   02:12:52  (  70.66, 146.80)    2.06                26
 12/19/2021   03:03:09   ( -70.54, -45.73) 12/19/2021   03:02:22  ( -70.54, -45.73)    0.34                47
 12/21/2021   16:49:04   (  71.34, -73.48) 12/21/2021   16:50:12  (  71.27, -71.64)   66.17                68
 12/21/2021   17:39:36   ( -70.66,  94.99) 12/21/2021   17:39:51  ( -70.67,  95.06)    2.97                15
 12/21/2021   18:30:20   (  70.53, -97.49) 12/21/2021   18:29:19  (  70.51, -97.54)    3.25                61
 12/24/2021   08:16:07   ( -70.99,-124.65) 12/24/2021   08:17:18  ( -70.90,-123.98)   26.26                71
 12/24/2021   09:06:46   (  70.61,  43.29) 12/24/2021   09:06:48  (  70.63,  43.25)    2.53                 2
 12/24/2021   09:57:30   ( -70.55,-149.29) 12/24/2021   09:56:18  ( -70.52,-149.28)    3.40                72