Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 8 16.  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   (  70.11,  92.05) 08/18/2021   05:51:55  (  70.11,  91.98)    2.71                66
 08/18/2021   06:41:30   ( -70.02,-100.50) 08/18/2021   06:41:23  ( -70.05,-100.47)    2.73                 7
 08/18/2021   07:32:07   (  69.58,  67.47) 08/18/2021   07:30:56  (  69.61,  66.57)   35.09                71
 08/20/2021   22:07:08   (  70.20,-152.15) 08/20/2021   22:08:19  (  70.17,-152.05)    4.82                71
 08/20/2021   22:57:49   ( -70.06,  15.39) 08/20/2021   22:57:49  ( -70.06,  15.42)    1.38                 0
 08/20/2021   23:48:30   (  69.83,-176.96) 08/20/2021   23:47:17  (  69.89,-177.16)   10.40                73
 08/23/2021   14:23:31   (  70.45, -36.60) 08/23/2021   14:24:42  (  70.34, -35.93)   27.72                71
 08/23/2021   15:14:07   ( -70.05, 131.35) 08/23/2021   15:14:15  ( -70.06, 131.31)    2.24                 8
 08/23/2021   16:04:51   (  69.98, -61.23) 08/23/2021   16:03:42  (  69.95, -61.20)    3.25                69
 08/26/2021   06:39:54   (  70.70,  78.94) 08/26/2021   06:41:03  (  70.61,  80.35)   52.74                69
 08/26/2021   07:30:26   ( -70.09,-112.77) 08/26/2021   07:30:41  ( -70.06,-112.81)    3.26                15
 08/26/2021   08:21:09   (  69.97,  54.73) 08/26/2021   08:20:08  (  69.95,  54.68)    2.87                61
 08/28/2021   22:56:16   (  70.95,-165.53) 08/28/2021   22:57:23  (  70.88,-163.36)   79.17                67
 08/28/2021   23:46:44   ( -70.13,   3.11) 08/28/2021   23:47:05  ( -70.12,   3.15)    1.99                21
 08/29/2021   00:37:27   (  70.01, 170.62) 08/29/2021   00:36:32  (  70.00, 170.63)    0.91                55