Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 8 18.  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   (  70.12,  92.04) 08/18/2021   05:51:55  (  70.11,  91.98)    2.71                66
 08/18/2021   06:41:31   ( -70.03,-100.51) 08/18/2021   06:41:24  ( -70.04,-100.48)    1.52                 7
 08/18/2021   07:32:08   (  69.59,  67.46) 08/18/2021   07:30:57  (  69.61,  66.57)   34.81                71
 08/20/2021   22:07:08   (  70.21,-152.16) 08/20/2021   22:08:19  (  70.17,-152.06)    6.17                71
 08/20/2021   22:57:49   ( -70.07,  15.37) 08/20/2021   22:57:49  ( -70.05,  15.41)    3.03                 0
 08/20/2021   23:48:30   (  69.84,-176.97) 08/20/2021   23:47:17  (  69.89,-177.17)    9.22                73
 08/23/2021   14:23:31   (  70.46, -36.62) 08/23/2021   14:24:42  (  70.33, -35.94)   29.20                71
 08/23/2021   15:14:07   ( -70.06, 131.33) 08/23/2021   15:14:15  ( -70.05, 131.29)    1.80                 8
 08/23/2021   16:04:50   (  69.94, -61.17) 08/23/2021   16:03:42  (  69.94, -61.21)    1.67                68
 08/26/2021   06:39:54   (  70.72,  78.91) 08/26/2021   06:41:03  (  70.60,  80.33)   54.03                69
 08/26/2021   07:30:26   ( -70.11,-112.80) 08/26/2021   07:30:40  ( -70.11,-112.75)    1.89                14
 08/26/2021   08:21:09   (  69.99,  54.70) 08/26/2021   08:20:07  (  70.00,  54.74)    1.67                62
 08/28/2021   22:56:17   (  70.97,-165.57) 08/28/2021   22:57:24  (  70.86,-163.38)   80.49                67
 08/28/2021   23:46:44   ( -70.11,   3.15) 08/28/2021   23:47:06  ( -70.10,   3.12)    1.21                22
 08/29/2021   00:37:27   (  69.98, 170.66) 08/29/2021   00:36:33  (  69.99, 170.61)    1.96                54
 08/31/2021   16:03:02   ( -70.16, 119.02) 08/31/2021   16:03:30  ( -70.15, 119.07)    2.22                28
 08/31/2021   16:53:45   (  70.03, -73.47) 08/31/2021   16:52:57  (  70.03, -73.45)    0.93                48