Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 6 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)
 06/10/2021   10:14:23   ( -71.70,-156.90) 06/10/2021   10:15:32  ( -71.56,-155.33)   57.03                69
 06/10/2021   11:04:57   (  71.07,  11.52) 06/10/2021   11:05:06  (  71.09,  11.55)    2.57                 9
 06/10/2021   11:55:38   ( -70.97, 179.00) 06/10/2021   11:54:36  ( -70.97, 179.00)    0.38                62
 06/13/2021   02:30:49   ( -72.05, -41.63) 06/13/2021   02:31:55  ( -71.94, -38.80)   98.03                66
 06/13/2021   03:21:16   (  71.07, 127.45) 06/13/2021   03:21:36  (  71.09, 127.43)    2.33                20
 06/13/2021   04:11:57   ( -70.97, -65.05) 06/13/2021   04:11:06  ( -70.98, -65.11)    2.32                51
 06/15/2021   19:37:35   (  71.08,-116.61) 06/15/2021   19:38:06  (  71.09,-116.69)    3.13                31
 06/15/2021   20:28:17   ( -71.02,  50.80) 06/15/2021   20:27:35  ( -71.03,  50.85)    2.21                42
 06/18/2021   11:53:55   (  71.14,  -0.77) 06/18/2021   11:54:35  (  71.14,  -0.73)    1.62                40
 06/18/2021   12:44:36   ( -71.02, 166.74) 06/18/2021   12:44:05  ( -71.03, 166.73)    1.04                31
 06/21/2021   04:10:13   (  71.14, 115.16) 06/21/2021   04:11:04  (  71.13, 115.14)    1.38                51
 06/21/2021   05:00:54   ( -71.02, -77.32) 06/21/2021   05:00:34  ( -71.02, -77.40)    2.89                20