Simultaneous Nadir Overpasses (SNOs) between FY3D and TERRA
TLE Epoch: 2021 8 19.  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)
 08/20/2021   22:07:08   (  70.18,-152.11) 08/20/2021   22:08:19  (  70.20,-152.02)    3.98                71
 08/20/2021   22:57:49   ( -70.05,  15.41) 08/20/2021   22:57:50  ( -70.02,  15.37)    3.02                 1
 08/20/2021   23:48:30   (  69.81,-176.92) 08/20/2021   23:47:18  (  69.86,-177.20)   12.08                72
 08/23/2021   14:23:31   (  70.43, -36.57) 08/23/2021   14:24:42  (  70.36, -35.90)   26.27                71
 08/23/2021   15:14:08   ( -70.09, 131.29) 08/23/2021   15:14:15  ( -70.08, 131.34)    1.82                 7
 08/23/2021   16:04:51   (  69.96, -61.20) 08/23/2021   16:03:42  (  69.98, -61.17)    1.94                69
 08/26/2021   06:39:53   (  70.69,  78.96) 08/26/2021   06:41:03  (  70.58,  80.30)   50.76                70
 08/26/2021   07:30:25   ( -70.08,-112.75) 08/26/2021   07:30:40  ( -70.08,-112.78)    1.24                15
 08/26/2021   08:21:08   (  69.95,  54.75) 08/26/2021   08:20:07  (  69.97,  54.71)    2.69                61
 08/28/2021   22:56:17   (  70.99,-165.60) 08/28/2021   22:57:24  (  70.84,-163.42)   81.24                67
 08/28/2021   23:46:44   ( -70.13,   3.12) 08/28/2021   23:47:05  ( -70.13,   3.17)    1.98                21
 08/29/2021   00:37:27   (  70.00, 170.63) 08/29/2021   00:36:32  (  70.02, 170.66)    2.44                55
 08/31/2021   16:03:02   ( -70.12, 119.07) 08/31/2021   16:03:31  ( -70.13, 119.04)    1.29                29
 08/31/2021   16:53:45   (  69.99, -73.42) 08/31/2021   16:52:58  (  70.01, -73.48)    2.77                47