Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 9 15.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 09/15/2020   06:32:31   ( -71.04,-101.69) 09/15/2020   06:33:42  ( -70.87,-100.81)   36.69                71
 09/15/2020   07:23:08   (  70.56,  66.41) 09/15/2020   07:23:13  (  70.55,  66.35)    2.38                 5
 09/15/2020   08:13:49   ( -70.46,-126.11) 09/15/2020   08:12:43  ( -70.45,-126.18)    3.02                66
 09/17/2020   22:48:58   ( -71.26,  13.83) 09/17/2020   22:50:07  ( -71.15,  15.49)   60.80                69
 09/17/2020   23:39:31   (  70.58,-177.71) 09/17/2020   23:39:42  (  70.61,-177.70)    3.46                11
 09/18/2020   00:30:12   ( -70.48, -10.23) 09/18/2020   00:29:12  ( -70.50, -10.22)    2.46                60
 09/20/2020   15:05:25   ( -71.54, 129.26) 09/20/2020   15:06:31  ( -71.41, 131.80)   91.06                66
 09/20/2020   15:55:53   (  70.60, -61.83) 09/20/2020   15:56:11  (  70.60, -61.83)    0.38                18
 09/20/2020   16:46:34   ( -70.50, 105.66) 09/20/2020   16:45:41  ( -70.50, 105.65)    0.13                53
 09/23/2020   08:12:16   (  70.62,  54.05) 09/23/2020   08:12:41  (  70.59,  54.04)    3.28                25
 09/23/2020   09:02:57   ( -70.52,-138.46) 09/23/2020   09:02:11  ( -70.49,-138.48)    3.16                46
 09/26/2020   00:28:39   (  70.65, 169.92) 09/26/2020   00:29:10  (  70.64, 169.99)    2.71                31
 09/26/2020   01:19:20   ( -70.54, -22.59) 09/26/2020   01:18:40  ( -70.54, -22.53)    2.18                40
 09/28/2020   16:45:01   (  70.62, -74.12) 09/28/2020   16:45:40  (  70.62, -74.16)    1.21                39
 09/28/2020   17:35:42   ( -70.52,  93.37) 09/28/2020   17:35:10  ( -70.52,  93.33)    1.80                32