Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 22.  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)
 07/23/2021   09:07:24   (  71.19,  41.02) 07/23/2021   09:07:50  (  71.19,  41.08)    2.33                26
 07/23/2021   09:58:05   ( -71.05,-151.41) 07/23/2021   09:57:20  ( -71.07,-151.46)    3.16                45
 07/26/2021   01:23:42   (  71.22, 156.92) 07/26/2021   01:24:19  (  71.21, 157.01)    3.37                37
 07/26/2021   02:14:24   ( -71.12, -35.60) 07/26/2021   02:13:49  ( -71.10, -35.54)    3.36                35
 07/28/2021   17:40:00   (  71.20, -87.10) 07/28/2021   17:40:50  (  71.18, -87.17)    3.17                50
 07/28/2021   18:30:42   ( -71.10,  80.39) 07/28/2021   18:30:19  ( -71.13,  80.38)    3.18                23
 07/31/2021   09:56:19   (  71.23,  28.78) 07/31/2021   09:57:19  (  71.25,  28.83)    2.66                60
 07/31/2021   10:47:01   ( -71.13,-163.72) 07/31/2021   10:46:49  ( -71.15,-163.71)    2.33                12
 07/31/2021   11:37:34   (  70.51,   4.63) 07/31/2021   11:36:25  (  70.55,   3.01)   60.20                69
 08/03/2021   02:12:38   (  71.27, 144.66) 08/03/2021   02:13:49  (  71.27, 144.73)    2.21                71
 08/03/2021   03:03:20   ( -71.16, -47.83) 08/03/2021   03:03:19  ( -71.17, -47.80)    1.22                 1
 08/03/2021   03:54:00   (  70.91, 119.92) 08/03/2021   03:52:48  (  70.94, 119.50)   15.77                72
 08/05/2021   18:29:03   (  71.67,-100.11) 08/05/2021   18:30:13  (  71.54, -98.94)   43.26                70
 08/05/2021   19:19:38   ( -71.19,  68.05) 08/05/2021   19:19:48  ( -71.18,  68.10)    2.55                10
 08/05/2021   20:10:20   (  71.05,-124.38) 08/05/2021   20:09:15  (  71.06,-124.44)    2.67                65