Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 12.  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   (  71.08, -42.53) 05/14/2021   14:41:11  (  71.10, -42.50)    2.19                51
 05/14/2021   15:31:01   ( -70.98, 124.97) 05/14/2021   15:30:41  ( -70.99, 124.95)    1.04                20
 05/14/2021   16:21:29   (  70.04, -66.20) 05/14/2021   16:20:23  (  70.07, -68.78)   97.75                66
 05/17/2021   06:56:39   (  71.12,  73.35) 05/17/2021   06:57:41  (  71.09,  73.36)    2.96                62
 05/17/2021   07:47:20   ( -71.02,-119.16) 05/17/2021   07:47:10  ( -71.04,-119.09)    3.43                10
 05/17/2021   08:37:55   (  70.44,  49.10) 05/17/2021   08:36:45  (  70.50,  47.73)   51.41                70
 05/19/2021   23:12:59   (  71.16,-170.78) 05/19/2021   23:14:11  (  71.14,-170.69)    4.05                72
 05/20/2021   00:03:39   ( -71.00,  -3.19) 05/20/2021   00:03:41  ( -71.03,  -3.23)    3.30                 2
 05/20/2021   00:54:22   (  70.85, 164.38) 05/20/2021   00:53:09  (  70.87, 164.17)    7.95                73
 05/22/2021   15:29:26   (  71.56, -55.56) 05/22/2021   15:30:36  (  71.44, -54.31)   45.79                70
 05/22/2021   16:19:59   ( -71.04, 112.68) 05/22/2021   16:20:12  ( -71.02, 112.63)    3.37                13
 05/22/2021   17:10:43   (  70.94, -79.84) 05/22/2021   17:09:38  (  70.96, -79.81)    2.76                65
 05/25/2021   07:45:53   (  71.96,  59.63) 05/25/2021   07:46:59  (  71.86,  62.26)   91.51                66
 05/25/2021   08:36:18   ( -71.03,-131.37) 05/25/2021   08:36:42  ( -71.05,-131.44)    3.46                24
 05/25/2021   09:27:02   (  70.93,  36.11) 05/25/2021   09:26:09  (  70.94,  36.04)    2.97                53