Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 10 9.  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)
 10/10/2021   20:58:15   (  70.35,-134.76) 10/10/2021   20:59:22  (  70.36,-134.82)    2.46                67
 10/10/2021   21:48:56   ( -70.26,  32.70) 10/10/2021   21:48:52  ( -70.25,  32.65)    2.66                 4
 10/10/2021   22:39:35   (  69.88,-159.40) 10/10/2021   22:38:23  (  69.92,-160.17)   29.58                72
 10/13/2021   13:14:35   (  70.49, -19.03) 10/13/2021   13:15:46  (  70.44, -18.83)    9.23                71
 10/13/2021   14:05:14   ( -70.28, 148.61) 10/13/2021   14:05:17  ( -70.27, 148.56)    2.40                 3
 10/13/2021   14:55:57   (  70.12, -43.82) 10/13/2021   14:54:44  (  70.16, -43.95)    6.36                73
 10/16/2021   05:30:57   (  70.73,  96.53) 10/16/2021   05:32:08  (  70.62,  97.32)   31.77                71
 10/16/2021   06:21:32   ( -70.31, -95.48) 10/16/2021   06:21:42  ( -70.29, -95.53)    3.16                10
 10/16/2021   07:12:16   (  70.21,  71.99) 10/16/2021   07:11:08  (  70.23,  72.04)    3.04                68
 10/18/2021   21:47:18   (  70.97,-147.93) 10/18/2021   21:48:27  (  70.90,-146.37)   57.35                69
 10/18/2021   22:37:49   ( -70.34,  20.42) 10/18/2021   22:38:05  ( -70.35,  20.45)    1.64                16
 10/18/2021   23:28:33   (  70.24,-172.11) 10/18/2021   23:27:32  (  70.24,-172.07)    1.66                61
 10/21/2021   14:03:41   (  71.27, -32.50) 10/21/2021   14:04:47  (  71.17, -30.06)   87.91                66
 10/21/2021   14:54:07   ( -70.37, 136.32) 10/21/2021   14:54:30  ( -70.36, 136.34)    2.12                23
 10/21/2021   15:44:50   (  70.23, -56.14) 10/21/2021   15:43:57  (  70.24, -56.19)    2.10                53