Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 24.  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)
 09/25/2021   18:10:49   ( -71.39,  85.32) 09/25/2021   18:11:59  ( -71.38,  85.40)    2.86                70
 09/25/2021   19:01:33   (  71.28,-107.18) 09/25/2021   19:01:26  (  71.29,-107.10)    3.13                 7
 09/25/2021   19:52:11   ( -71.03,  60.58) 09/25/2021   19:50:58  ( -71.06,  60.17)   15.22                73
 09/28/2021   10:27:14   ( -71.76,-159.41) 09/28/2021   10:28:24  ( -71.67,-158.24)   41.84                70
 09/28/2021   11:17:51   (  71.29,   8.74) 09/28/2021   11:17:56  (  71.31,   8.80)    2.59                 5
 09/28/2021   12:08:32   ( -71.20, 176.24) 09/28/2021   12:07:26  ( -71.19, 176.25)    0.83                66
 10/01/2021   02:43:40   ( -72.18, -44.27) 10/01/2021   02:44:46  ( -72.11, -41.60)   91.28                66
 10/01/2021   03:34:09   (  71.31, 124.66) 10/01/2021   03:34:26  (  71.32, 124.70)    1.46                17
 10/01/2021   04:24:50   ( -71.21, -67.84) 10/01/2021   04:23:56  ( -71.20, -67.85)    0.92                54
 10/03/2021   19:50:26   (  71.33,-119.43) 10/03/2021   19:50:55  (  71.32,-119.42)    1.00                29
 10/03/2021   20:41:07   ( -71.23,  48.07) 10/03/2021   20:40:25  ( -71.21,  48.04)    2.35                42
 10/06/2021   12:06:44   (  71.35,  -3.52) 10/06/2021   12:07:24  (  71.38,  -3.45)    3.44                40
 10/06/2021   12:57:25   ( -71.25, 163.99) 10/06/2021   12:56:54  ( -71.27, 164.01)    2.20                31