Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 6 20.  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)
 06/22/2021   22:26:52   (  69.90,-157.07) 06/22/2021   22:27:58  (  69.89,-157.09)    0.81                66
 06/22/2021   23:17:33   ( -69.79,  10.41) 06/22/2021   23:17:28  ( -69.78,  10.40)    1.19                 5
 06/23/2021   00:08:11   (  69.37, 178.33) 06/23/2021   00:06:59  (  69.45, 177.59)   30.24                72
 06/25/2021   14:43:12   (  69.96, -41.23) 06/25/2021   14:44:24  (  69.92, -41.17)    5.25                72
 06/25/2021   15:33:52   ( -69.79, 126.34) 06/25/2021   15:33:54  ( -69.81, 126.32)    2.18                 2
 06/25/2021   16:24:35   (  69.65, -66.13) 06/25/2021   16:23:22  (  69.64, -66.26)    5.27                73
 06/28/2021   06:59:36   (  70.24,  74.28) 06/28/2021   07:00:47  (  70.11,  74.98)   29.97                71
 06/28/2021   07:50:12   ( -69.85,-117.81) 06/28/2021   07:50:20  ( -69.84,-117.76)    2.17                 8
 06/28/2021   08:40:55   (  69.71,  49.72) 06/28/2021   08:39:47  (  69.72,  49.72)    1.33                68
 06/30/2021   23:15:58   (  70.46,-170.13) 06/30/2021   23:17:08  (  70.35,-168.79)   51.50                70
 07/01/2021   00:06:30   ( -69.86,  -1.88) 07/01/2021   00:06:45  ( -69.86,  -1.85)    1.02                15
 07/01/2021   00:57:13   (  69.73, 165.64) 07/01/2021   00:56:12  (  69.75, 165.63)    1.95                61
 07/03/2021   15:32:22   (  70.74, -54.64) 07/03/2021   15:33:29  (  70.64, -52.48)   80.21                67
 07/03/2021   16:22:49   ( -69.87, 114.05) 07/03/2021   16:23:11  ( -69.88, 114.06)    1.37                22
 07/03/2021   17:13:32   (  69.74, -78.45) 07/03/2021   17:12:38  (  69.76, -78.46)    2.10                54