Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 14.  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)
 05/14/2021   14:40:20   (  71.07, -42.52) 05/14/2021   14:41:12  (  71.05, -42.58)    3.18                52
 05/14/2021   15:31:01   ( -70.98, 124.97) 05/14/2021   15:30:41  ( -70.99, 124.96)    1.88                20
 05/14/2021   16:21:29   (  70.03, -66.19) 05/14/2021   16:20:23  (  70.07, -68.77)   97.94                66
 05/17/2021   06:56:39   (  71.11,  73.35) 05/17/2021   06:57:41  (  71.10,  73.37)    1.70                62
 05/17/2021   07:47:20   ( -71.02,-119.16) 05/17/2021   07:47:11  ( -70.99,-119.17)    3.13                 9
 05/17/2021   08:37:55   (  70.44,  49.11) 05/17/2021   08:36:45  (  70.51,  47.74)   51.47                70
 05/19/2021   23:12:59   (  71.16,-170.79) 05/19/2021   23:14:11  (  71.14,-170.68)    4.37                72
 05/20/2021   00:03:39   ( -71.01,  -3.21) 05/20/2021   00:03:41  ( -71.03,  -3.22)    2.60                 2
 05/20/2021   00:54:22   (  70.85, 164.37) 05/20/2021   00:53:09  (  70.88, 164.18)    7.48                73
 05/22/2021   15:29:26   (  71.58, -55.59) 05/22/2021   15:30:36  (  71.45, -54.30)   47.45                70
 05/22/2021   16:19:59   ( -71.06, 112.64) 05/22/2021   16:20:11  ( -71.07, 112.72)    3.13                12
 05/22/2021   17:10:43   (  70.96, -79.87) 05/22/2021   17:09:38  (  70.97, -79.80)    2.91                65
 05/25/2021   07:45:53   (  72.00,  59.57) 05/25/2021   07:46:58  (  71.92,  62.36)   96.66                65
 05/25/2021   08:36:18   ( -71.07,-131.43) 05/25/2021   08:36:42  ( -71.06,-131.43)    1.47                24
 05/25/2021   09:27:02   (  70.97,  36.06) 05/25/2021   09:26:09  (  70.95,  36.05)    1.98                53
 05/28/2021   00:52:36   ( -71.08, -15.51) 05/28/2021   00:53:11  ( -71.09, -15.50)    0.68                35
 05/28/2021   01:43:20   (  70.98, 151.97) 05/28/2021   01:42:38  (  70.98, 151.97)    0.36                42