Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 8 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)
 08/10/2021   05:01:54   (  70.09, 104.25) 08/10/2021   05:02:37  (  70.09, 104.32)    2.41                43
 08/10/2021   05:52:35   ( -69.94, -88.21) 08/10/2021   05:52:07  ( -69.97, -88.22)    3.37                28
 08/12/2021   21:18:13   (  70.12,-139.86) 08/12/2021   21:19:03  (  70.11,-139.78)    3.33                50
 08/12/2021   22:08:54   ( -69.98,  27.68) 08/12/2021   22:08:33  ( -69.99,  27.69)    1.74                21
 08/12/2021   22:59:21   (  69.01,-163.60) 08/12/2021   22:58:15  (  69.06,-165.92)   92.37                66
 08/15/2021   13:34:30   (  70.11, -23.89) 08/15/2021   13:35:28  (  70.12, -23.88)    1.37                58
 08/15/2021   14:25:12   ( -70.01, 143.57) 08/15/2021   14:24:58  ( -70.01, 143.59)    1.17                14
 08/15/2021   15:15:44   (  69.32, -48.09) 08/15/2021   15:14:35  (  69.35, -49.66)   62.00                69
 08/18/2021   05:50:49   (  70.15,  91.99) 08/18/2021   05:51:54  (  70.13,  92.01)    2.31                65
 08/18/2021   06:41:30   ( -70.00,-100.47) 08/18/2021   06:41:24  ( -70.02,-100.51)    2.63                 6
 08/18/2021   07:32:07   (  69.57,  67.49) 08/18/2021   07:30:56  (  69.63,  66.60)   35.45                71
 08/20/2021   22:07:08   (  70.19,-152.13) 08/20/2021   22:08:19  (  70.18,-152.03)    3.62                71
 08/20/2021   22:57:49   ( -70.04,  15.42) 08/20/2021   22:57:50  ( -70.02,  15.38)    2.51                 1
 08/20/2021   23:48:30   (  69.82,-176.94) 08/20/2021   23:47:18  (  69.85,-177.22)   11.31                72