Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 10 19.  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)
 10/21/2021   14:03:41   (  71.28, -32.51) 10/21/2021   14:04:47  (  71.17, -30.06)   88.36                66
 10/21/2021   14:54:06   ( -70.34, 136.37) 10/21/2021   14:54:30  ( -70.35, 136.32)    2.22                24
 10/21/2021   15:44:50   (  70.24, -56.15) 10/21/2021   15:43:57  (  70.24, -56.19)    1.50                53
 10/24/2021   07:10:24   ( -70.38,-107.74) 10/24/2021   07:10:54  ( -70.40,-107.72)    2.14                30
 10/24/2021   08:01:08   (  70.28,  59.73) 10/24/2021   08:00:21  (  70.29,  59.76)    1.50                47
 10/26/2021   23:26:42   ( -70.42,   8.15) 10/26/2021   23:27:19  ( -70.39,   8.14)    3.59                37
 10/27/2021   00:17:25   (  70.28, 175.69) 10/27/2021   00:16:46  (  70.28, 175.63)    2.29                39
 10/29/2021   15:42:58   ( -70.41, 124.11) 10/29/2021   15:43:42  ( -70.43, 124.08)    1.88                44
 10/29/2021   16:33:42   (  70.33, -68.44) 10/29/2021   16:33:09  (  70.31, -68.44)    1.89                33
 11/01/2021   07:59:16   ( -70.46,-120.01) 11/01/2021   08:00:06  ( -70.46,-119.99)    0.97                50
 11/01/2021   08:49:59   (  70.33,  47.51) 11/01/2021   08:49:33  (  70.34,  47.49)    1.32                26