Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 6 5.  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)
 06/05/2021   02:32:19   (  71.02, 139.73) 06/05/2021   02:32:08  (  71.02, 139.67)    1.91                11
 06/05/2021   03:22:54   ( -70.61, -52.28) 06/05/2021   03:21:42  ( -70.68, -53.21)   35.28                72
 06/07/2021   17:57:57   ( -71.28,  87.90) 06/07/2021   17:59:09  ( -71.23,  88.25)   13.78                72
 06/07/2021   18:48:39   (  71.07,-104.42) 06/07/2021   18:48:37  (  71.08,-104.34)    3.09                 2
 06/07/2021   19:39:20   ( -70.98,  63.06) 06/07/2021   19:38:07  ( -70.97,  63.11)    1.98                73
 06/10/2021   10:14:23   ( -71.70,-156.90) 06/10/2021   10:15:32  ( -71.56,-155.33)   57.10                69
 06/10/2021   11:04:57   (  71.08,  11.51) 06/10/2021   11:05:06  (  71.09,  11.55)    1.86                 9
 06/10/2021   11:55:38   ( -70.98, 179.00) 06/10/2021   11:54:36  ( -70.97, 179.00)    0.11                62
 06/13/2021   02:30:49   ( -72.06, -41.64) 06/13/2021   02:31:55  ( -71.94, -38.80)   98.47                66
 06/13/2021   03:21:16   (  71.08, 127.44) 06/13/2021   03:21:36  (  71.09, 127.43)    0.80                20
 06/13/2021   04:11:57   ( -70.98, -65.06) 06/13/2021   04:11:06  ( -70.98, -65.11)    1.86                51
 06/15/2021   19:37:35   (  71.09,-116.64) 06/15/2021   19:38:06  (  71.09,-116.69)    1.88                31
 06/15/2021   20:28:17   ( -71.03,  50.78) 06/15/2021   20:27:35  ( -71.04,  50.86)    2.68                42
 06/18/2021   11:53:55   (  71.16,  -0.81) 06/18/2021   11:54:35  (  71.14,  -0.73)    3.51                40
 06/18/2021   12:44:36   ( -71.04, 166.71) 06/18/2021   12:44:05  ( -71.03, 166.74)    1.00                31