Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 4 8.  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)
 04/09/2021   17:26:54   (  71.82, -85.67) 04/09/2021   17:28:01  (  71.71, -83.33)   82.24                67
 04/09/2021   18:17:22   ( -71.01,  83.11) 04/09/2021   18:17:42  ( -71.00,  83.15)    1.60                20
 04/09/2021   19:08:05   (  70.89,-109.39) 04/09/2021   19:07:09  (  70.90,-109.36)    1.06                56
 04/12/2021   10:33:42   ( -71.02,-160.97) 04/12/2021   10:34:10  ( -71.00,-160.97)    1.44                28
 04/12/2021   11:24:25   (  70.90,   6.53) 04/12/2021   11:23:37  (  70.90,   6.52)    0.72                48
 04/15/2021   02:50:01   ( -71.03, -45.06) 04/15/2021   02:50:37  ( -71.01, -45.09)    3.01                36
 04/15/2021   03:40:44   (  70.92, 122.44) 04/15/2021   03:40:04  (  70.90, 122.39)    3.04                40
 04/17/2021   19:06:21   ( -71.05,  70.85) 04/17/2021   19:07:04  ( -71.06,  70.87)    1.27                43
 04/17/2021   19:57:04   (  70.94,-121.65) 04/17/2021   19:56:31  (  70.95,-121.66)    1.16                33
 04/20/2021   11:22:41   ( -71.07,-173.25) 04/20/2021   11:23:32  ( -71.05,-173.26)    2.12                51
 04/20/2021   12:13:24   (  70.95,  -5.75) 04/20/2021   12:12:59  (  70.94,  -5.80)    2.79                25