Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 10 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)
 10/18/2021   21:47:18   (  70.97,-147.93) 10/18/2021   21:48:27  (  70.90,-146.37)   57.46                69
 10/18/2021   22:37:49   ( -70.35,  20.41) 10/18/2021   22:38:05  ( -70.35,  20.44)    1.28                16
 10/18/2021   23:28:33   (  70.24,-172.11) 10/18/2021   23:27:32  (  70.24,-172.07)    1.73                61
 10/21/2021   14:03:41   (  71.27, -32.50) 10/21/2021   14:04:47  (  71.17, -30.06)   88.13                66
 10/21/2021   14:54:06   ( -70.33, 136.39) 10/21/2021   14:54:30  ( -70.35, 136.32)    2.95                24
 10/21/2021   15:44:50   (  70.23, -56.14) 10/21/2021   15:43:57  (  70.24, -56.19)    2.05                53
 10/24/2021   07:10:24   ( -70.37,-107.72) 10/24/2021   07:10:54  ( -70.40,-107.72)    3.45                30
 10/24/2021   08:01:08   (  70.28,  59.74) 10/24/2021   08:00:21  (  70.29,  59.77)    2.13                47
 10/26/2021   23:26:42   ( -70.41,   8.16) 10/26/2021   23:27:19  ( -70.39,   8.15)    2.24                37
 10/27/2021   00:17:24   (  70.27, 175.70) 10/27/2021   00:16:45  (  70.28, 175.63)    2.80                39
 10/29/2021   15:42:59   ( -70.45, 124.05) 10/29/2021   15:43:42  ( -70.43, 124.09)    3.19                43
 10/29/2021   16:33:42   (  70.32, -68.43) 10/29/2021   16:33:09  (  70.31, -68.44)    0.76                33