Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 6 13.  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)
 06/13/2021   03:21:16   (  71.08, 127.45) 06/13/2021   03:21:36  (  71.09, 127.43)    2.10                20
 06/13/2021   04:11:57   ( -70.98, -65.06) 06/13/2021   04:11:06  ( -70.97, -65.12)    2.33                51
 06/15/2021   19:37:35   (  71.08,-116.61) 06/15/2021   19:38:06  (  71.09,-116.69)    3.02                31
 06/15/2021   20:28:17   ( -71.03,  50.79) 06/15/2021   20:27:35  ( -71.03,  50.84)    1.82                42
 06/18/2021   11:53:55   (  71.14,  -0.77) 06/18/2021   11:54:35  (  71.14,  -0.73)    1.33                40
 06/18/2021   12:44:36   ( -71.03, 166.74) 06/18/2021   12:44:05  ( -71.02, 166.72)    0.80                31
 06/21/2021   04:10:13   (  71.14, 115.16) 06/21/2021   04:11:04  (  71.13, 115.13)    2.03                51
 06/21/2021   05:00:55   ( -71.08, -77.41) 06/21/2021   05:00:33  ( -71.07, -77.33)    3.16                22
 06/23/2021   20:26:32   (  71.15,-128.91) 06/23/2021   20:27:33  (  71.16,-128.93)    2.04                61
 06/23/2021   21:17:14   ( -71.08,  38.53) 06/23/2021   21:17:03  ( -71.06,  38.53)    2.43                11
 06/23/2021   22:07:48   (  70.47,-153.15) 06/23/2021   22:06:38  (  70.52,-154.65)   55.90                70
 06/26/2021   12:42:52   (  71.21, -13.07) 06/26/2021   12:44:02  (  71.20, -12.99)    3.01                70
 06/26/2021   13:33:33   ( -71.08, 154.47) 06/26/2021   13:33:32  ( -71.09, 154.47)    1.64                 1
 06/26/2021   14:24:14   (  70.85, -37.82) 06/26/2021   14:23:01  (  70.88, -38.22)   14.85                73