Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 8 18.  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)
 08/19/2021   04:41:10   ( -71.29, -72.38) 08/19/2021   04:42:15  ( -71.27, -72.37)    2.12                65
 08/19/2021   05:31:53   (  71.17,  95.14) 08/19/2021   05:31:42  (  71.17,  95.12)    0.64                11
 08/19/2021   06:22:28   ( -70.72, -96.78) 08/19/2021   06:21:17  ( -70.78, -97.85)   39.72                71
 08/21/2021   20:57:31   ( -71.43,  43.31) 08/21/2021   20:58:43  ( -71.36,  43.67)   14.76                72
 08/21/2021   21:48:12   (  71.21,-148.99) 08/21/2021   21:48:11  (  71.21,-148.93)    1.99                 1
 08/21/2021   22:38:54   ( -71.12,  18.48) 08/21/2021   22:37:41  ( -71.10,  18.53)    3.12                73
 08/24/2021   13:13:57   ( -71.83, 158.52) 08/24/2021   13:15:06  ( -71.73, 160.16)   58.27                69
 08/24/2021   14:04:30   (  71.20, -33.03) 08/24/2021   14:04:41  (  71.19, -33.08)    2.09                11
 08/24/2021   14:55:12   ( -71.12, 134.44) 08/24/2021   14:54:10  ( -71.14, 134.47)    2.98                62
 08/27/2021   06:20:48   (  71.25,  82.84) 08/27/2021   06:21:09  (  71.23,  82.85)    2.48                21
 08/27/2021   07:11:29   ( -71.11,-109.61) 08/27/2021   07:10:39  ( -71.12,-109.68)    2.85                50
 08/29/2021   22:37:06   (  71.24,-161.21) 08/29/2021   22:37:38  (  71.25,-161.22)    1.39                32
 08/29/2021   23:27:48   ( -71.16,   6.25) 08/29/2021   23:27:08  ( -71.15,   6.25)    0.51                40