Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 23.  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   ( -71.83, 158.52) 08/24/2021   13:15:06  ( -71.72, 160.15)   58.11                69
 08/24/2021   14:04:30   (  71.20, -33.02) 08/24/2021   14:04:41  (  71.19, -33.08)    2.07                11
 08/24/2021   14:55:12   ( -71.12, 134.44) 08/24/2021   14:54:10  ( -71.14, 134.46)    2.28                62
 08/27/2021   06:20:48   (  71.24,  82.85) 08/27/2021   06:21:09  (  71.23,  82.86)    1.14                21
 08/27/2021   07:11:29   ( -71.11,-109.60) 08/27/2021   07:10:39  ( -71.12,-109.68)    3.21                50
 08/29/2021   22:37:06   (  71.23,-161.19) 08/29/2021   22:37:38  (  71.26,-161.21)    3.18                32
 08/29/2021   23:27:48   ( -71.15,   6.27) 08/29/2021   23:27:08  ( -71.15,   6.25)    0.68                40
 09/01/2021   14:53:25   (  71.28, -45.32) 09/01/2021   14:54:07  (  71.28, -45.29)    1.48                42
 09/01/2021   15:44:07   ( -71.20, 122.13) 09/01/2021   15:43:37  ( -71.18, 122.17)    2.69                30
 09/04/2021   07:09:44   (  71.32,  70.54) 09/04/2021   07:10:36  (  71.31,  70.63)    3.71                52
 09/04/2021   08:00:25   ( -71.19,-121.92) 09/04/2021   08:00:06  ( -71.20,-121.91)    0.98                19