Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 9 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)
 09/14/2021   01:24:33   ( -70.28, -21.43) 09/14/2021   01:25:40  ( -70.25, -21.40)    2.74                67
 09/14/2021   02:15:16   (  70.12, 146.12) 09/14/2021   02:15:07  (  70.15, 146.10)    3.38                 9
 09/14/2021   03:05:53   ( -69.81, -46.08) 09/14/2021   03:04:40  ( -69.87, -46.66)   23.32                73
 09/16/2021   17:40:53   ( -70.38,  94.35) 09/16/2021   17:42:05  ( -70.34,  94.61)   10.76                72
 09/16/2021   18:31:35   (  70.18, -98.02) 09/16/2021   18:31:33  (  70.18, -97.98)    1.61                 2
 09/16/2021   19:22:16   ( -70.07,  69.46) 09/16/2021   19:21:03  ( -70.07,  69.50)    1.32                73
 09/19/2021   09:57:17   ( -70.70,-150.22) 09/19/2021   09:58:27  ( -70.59,-149.15)   41.30                70
 09/19/2021   10:47:53   (  70.18,  17.92) 09/19/2021   10:47:59  (  70.21,  17.94)    3.13                 6
 09/19/2021   11:38:34   ( -70.08,-174.60) 09/19/2021   11:37:29  ( -70.10,-174.58)    2.72                65
 09/22/2021   02:13:39   ( -70.96, -34.72) 09/22/2021   02:14:47  ( -70.89, -32.82)   69.30                68
 09/22/2021   03:04:11   (  70.24, 133.78) 09/22/2021   03:04:24  (  70.23, 133.84)    2.56                13
 09/22/2021   03:54:52   ( -70.13, -58.74) 09/22/2021   03:53:54  ( -70.12, -58.67)    2.64                58
 09/24/2021   19:20:29   (  70.24,-110.28) 09/24/2021   19:20:50  (  70.24,-110.26)    0.90                21
 09/24/2021   20:11:10   ( -70.14,  57.20) 09/24/2021   20:10:20  ( -70.14,  57.23)    1.04                50