Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 8 14.  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)
 08/15/2021   13:34:30   (  70.10, -23.87) 08/15/2021   13:35:29  (  70.07, -23.95)    3.71                59
 08/15/2021   14:25:12   ( -70.01, 143.58) 08/15/2021   14:24:58  ( -70.01, 143.60)    0.79                14
 08/15/2021   15:15:44   (  69.31, -48.07) 08/15/2021   15:14:35  (  69.36, -49.65)   62.30                69
 08/18/2021   05:50:49   (  70.13,  92.01) 08/18/2021   05:51:54  (  70.14,  92.02)    0.50                65
 08/18/2021   06:41:31   ( -70.05,-100.54) 08/18/2021   06:41:24  ( -70.02,-100.51)    2.94                 7
 08/18/2021   07:32:07   (  69.56,  67.51) 08/18/2021   07:30:56  (  69.64,  66.61)   36.20                71
 08/20/2021   22:07:08   (  70.17,-152.11) 08/20/2021   22:08:20  (  70.14,-152.09)    3.67                72
 08/20/2021   22:57:49   ( -70.03,  15.43) 08/20/2021   22:57:50  ( -70.03,  15.38)    1.75                 1
 08/20/2021   23:48:31   (  69.86,-177.00) 08/20/2021   23:47:18  (  69.87,-177.20)    7.90                73
 08/23/2021   14:23:30   (  70.42, -36.56) 08/23/2021   14:24:42  (  70.31, -35.98)   25.44                72
 08/23/2021   15:14:07   ( -70.08, 131.31) 08/23/2021   15:14:14  ( -70.09, 131.34)    1.93                 7
 08/23/2021   16:04:50   (  69.95, -61.19) 08/23/2021   16:03:41  (  69.97, -61.17)    2.45                69
 08/26/2021   06:39:53   (  70.68,  78.98) 08/26/2021   06:41:03  (  70.57,  80.30)   49.99                70
 08/26/2021   07:30:25   ( -70.07,-112.73) 08/26/2021   07:30:40  ( -70.09,-112.78)    2.88                15
 08/26/2021   08:21:09   (  70.00,  54.69) 08/26/2021   08:20:07  (  69.97,  54.70)    3.08                62