Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 4 9.  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, -85.65) 04/09/2021   17:28:01  (  71.72, -83.32)   81.99                67
 04/09/2021   18:17:22   ( -71.00,  83.12) 04/09/2021   18:17:42  ( -71.01,  83.16)    1.83                20
 04/09/2021   19:08:05   (  70.88,-109.37) 04/09/2021   19:07:09  (  70.91,-109.35)    2.92                56
 04/12/2021   10:33:41   ( -71.01,-160.96) 04/12/2021   10:34:09  ( -71.01,-160.95)    0.42                28
 04/12/2021   11:24:24   (  70.90,   6.54) 04/12/2021   11:23:36  (  70.91,   6.53)    1.43                48
 04/15/2021   02:50:01   ( -71.03, -45.05) 04/15/2021   02:50:37  ( -71.01, -45.08)    1.73                36
 04/15/2021   03:40:44   (  70.91, 122.45) 04/15/2021   03:40:04  (  70.91, 122.40)    1.91                40
 04/17/2021   19:06:21   ( -71.05,  70.85) 04/17/2021   19:07:04  ( -71.06,  70.88)    2.12                43
 04/17/2021   19:57:04   (  70.93,-121.65) 04/17/2021   19:56:31  (  70.95,-121.65)    2.21                33
 04/20/2021   11:22:41   ( -71.07,-173.25) 04/20/2021   11:23:32  ( -71.05,-173.26)    1.74                51
 04/20/2021   12:13:24   (  70.96,  -5.75) 04/20/2021   12:12:59  (  70.94,  -5.79)    2.18                25
 04/20/2021   13:03:50   ( -70.03, 163.07) 04/20/2021   13:02:44  ( -70.02, 160.48)   98.15                66