Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 10.  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)
 05/11/2021   22:24:00   (  71.05,-158.41) 05/11/2021   22:24:41  (  71.05,-158.47)    1.96                41
 05/11/2021   23:14:42   ( -71.00,   8.99) 05/11/2021   23:14:10  ( -70.99,   9.08)    3.21                32
 05/14/2021   14:40:20   (  71.09, -42.54) 05/14/2021   14:41:11  (  71.10, -42.51)    1.65                51
 05/14/2021   15:31:01   ( -70.98, 124.96) 05/14/2021   15:30:41  ( -70.99, 124.95)    0.64                20
 05/14/2021   16:21:29   (  70.04, -66.21) 05/14/2021   16:20:23  (  70.07, -68.78)   97.53                66
 05/17/2021   06:56:39   (  71.07,  73.42) 05/17/2021   06:57:42  (  71.09,  73.36)    2.96                63
 05/17/2021   07:47:20   ( -71.02,-119.17) 05/17/2021   07:47:10  ( -71.04,-119.09)    3.43                10
 05/17/2021   08:37:55   (  70.45,  49.09) 05/17/2021   08:36:45  (  70.50,  47.73)   50.89                70
 05/19/2021   23:12:59   (  71.17,-170.80) 05/19/2021   23:14:11  (  71.14,-170.69)    5.36                72
 05/20/2021   00:03:39   ( -71.01,  -3.21) 05/20/2021   00:03:41  ( -71.03,  -3.22)    2.31                 2
 05/20/2021   00:54:22   (  70.86, 164.36) 05/20/2021   00:53:09  (  70.87, 164.17)    6.96                73
 05/22/2021   15:29:26   (  71.58, -55.58) 05/22/2021   15:30:36  (  71.45, -54.31)   47.24                70
 05/22/2021   16:19:59   ( -71.06, 112.65) 05/22/2021   16:20:11  ( -71.07, 112.72)    3.16                12
 05/22/2021   17:10:43   (  70.96, -79.87) 05/22/2021   17:09:38  (  70.97, -79.80)    2.49                65