Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 8 17.  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)
 08/18/2021   05:50:49   (  70.14,  92.00) 08/18/2021   05:51:54  (  70.13,  92.01)    1.36                65
 08/18/2021   06:41:30   ( -70.01,-100.47) 08/18/2021   06:41:24  ( -70.01,-100.52)    2.08                 6
 08/18/2021   07:32:07   (  69.56,  67.50) 08/18/2021   07:30:56  (  69.64,  66.60)   35.73                71
 08/20/2021   22:07:08   (  70.18,-152.12) 08/20/2021   22:08:19  (  70.19,-152.02)    3.70                71
 08/20/2021   22:57:49   ( -70.05,  15.41) 08/20/2021   22:57:50  ( -70.02,  15.37)    3.11                 1
 08/20/2021   23:48:30   (  69.82,-176.93) 08/20/2021   23:47:18  (  69.86,-177.21)   11.81                72
 08/23/2021   14:23:31   (  70.43, -36.57) 08/23/2021   14:24:42  (  70.36, -35.90)   26.38                71
 08/23/2021   15:14:08   ( -70.09, 131.29) 08/23/2021   15:14:15  ( -70.08, 131.33)    1.71                 7
 08/23/2021   16:04:51   (  69.96, -61.21) 08/23/2021   16:03:42  (  69.97, -61.17)    1.54                69
 08/26/2021   06:39:53   (  70.69,  78.96) 08/26/2021   06:41:03  (  70.57,  80.30)   50.77                70
 08/26/2021   07:30:25   ( -70.08,-112.75) 08/26/2021   07:30:40  ( -70.08,-112.78)    1.41                15
 08/26/2021   08:21:08   (  69.95,  54.75) 08/26/2021   08:20:07  (  69.97,  54.70)    2.52                61
 08/28/2021   22:56:17   (  70.99,-165.60) 08/28/2021   22:57:24  (  70.84,-163.42)   81.17                67
 08/28/2021   23:46:44   ( -70.12,   3.13) 08/28/2021   23:47:05  ( -70.13,   3.17)    2.13                21
 08/29/2021   00:37:27   (  70.00, 170.63) 08/29/2021   00:36:32  (  70.02, 170.65)    2.40                55