Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 3 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)
 03/13/2021   21:52:49   ( -71.74,  27.85) 03/13/2021   21:53:56  ( -71.65,  30.16)   81.32                67
 03/13/2021   22:43:18   (  70.90,-163.36) 03/13/2021   22:43:35  (  70.90,-163.39)    1.59                17
 03/13/2021   23:34:00   ( -70.81,   4.11) 03/13/2021   23:33:05  ( -70.78,   4.06)    3.05                55
 03/16/2021   14:59:39   (  70.94, -47.50) 03/16/2021   15:00:02  (  70.92, -47.49)    2.39                23
 03/16/2021   15:50:21   ( -70.85, 119.97) 03/16/2021   15:49:31  ( -70.86, 120.05)    3.23                50
 03/19/2021   07:15:59   (  70.94,  68.44) 03/19/2021   07:16:29  (  70.93,  68.41)    0.99                30
 03/19/2021   08:06:41   ( -70.84,-124.08) 03/19/2021   08:05:59  ( -70.82,-124.12)    2.47                42
 03/21/2021   23:32:19   (  70.94,-175.63) 03/21/2021   23:32:56  (  70.94,-175.69)    2.48                37
 03/22/2021   00:23:02   ( -70.88,  -8.22) 03/22/2021   00:22:25  ( -70.89,  -8.14)    2.87                37
 03/24/2021   15:48:39   (  70.99, -59.78) 03/24/2021   15:49:21  (  71.00, -59.72)    2.43                42
 03/24/2021   16:39:21   ( -70.88, 107.72) 03/24/2021   16:38:51  ( -70.89, 107.75)    1.89                30