Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 22.  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)
 08/24/2021   13:13:57   ( -71.84, 158.51) 08/24/2021   13:15:06  ( -71.72, 160.14)   58.19                69
 08/24/2021   14:04:30   (  71.20, -33.03) 08/24/2021   14:04:41  (  71.19, -33.09)    2.72                11
 08/24/2021   14:55:12   ( -71.12, 134.43) 08/24/2021   14:54:10  ( -71.13, 134.45)    1.37                62
 08/27/2021   06:20:49   (  71.24,  82.85) 08/27/2021   06:21:10  (  71.22,  82.84)    2.48                21
 08/27/2021   07:11:31   ( -71.16,-109.69) 08/27/2021   07:10:39  ( -71.16,-109.61)    3.08                52
 08/29/2021   22:37:06   (  71.23,-161.19) 08/29/2021   22:37:38  (  71.25,-161.23)    2.27                32
 08/29/2021   23:27:48   ( -71.15,   6.27) 08/29/2021   23:27:08  ( -71.14,   6.23)    1.56                40
 09/01/2021   14:53:25   (  71.27, -45.32) 09/01/2021   14:54:07  (  71.27, -45.31)    0.49                42
 09/01/2021   15:44:07   ( -71.19, 122.14) 09/01/2021   15:43:37  ( -71.17, 122.16)    3.06                30
 09/04/2021   07:09:43   (  71.27,  70.64) 09/04/2021   07:10:36  (  71.29,  70.60)    3.04                53
 09/04/2021   08:00:25   ( -71.19,-121.91) 09/04/2021   08:00:06  ( -71.19,-121.93)    0.75                19