Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 3 18.  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)
 03/19/2021   07:16:00   (  70.97,  68.39) 03/19/2021   07:16:30  (  70.94,  68.43)    2.73                30
 03/19/2021   08:06:41   ( -70.82,-124.05) 03/19/2021   08:06:00  ( -70.83,-124.12)    2.84                41
 03/21/2021   23:32:19   (  70.96,-175.67) 03/21/2021   23:32:57  (  70.98,-175.64)    2.75                38
 03/22/2021   00:23:01   ( -70.86,  -8.18) 03/22/2021   00:22:27  ( -70.87,  -8.18)    1.10                34
 03/24/2021   15:48:39   (  70.95, -59.73) 03/24/2021   15:49:26  (  70.96, -59.80)    2.68                47
 03/24/2021   16:39:22   ( -70.90, 107.68) 03/24/2021   16:38:55  ( -70.91, 107.75)    2.75                27
 03/27/2021   08:05:00   (  71.00,  56.13) 03/27/2021   08:05:54  (  70.99,  56.12)    1.49                54
 03/27/2021   08:55:42   ( -70.90,-136.38) 03/27/2021   08:55:24  ( -70.88,-136.41)    1.69                18
 03/27/2021   09:46:10   (  70.01,  32.36) 03/27/2021   09:45:04  (  70.06,  30.02)   88.98                66
 03/30/2021   00:21:20   (  71.00, 172.06) 03/30/2021   00:22:22  (  71.01, 172.04)    1.75                62
 03/30/2021   01:12:02   ( -70.89, -20.43) 03/30/2021   01:11:52  ( -70.91, -20.49)    3.02                10
 03/30/2021   02:02:36   (  70.32, 147.81) 03/30/2021   02:01:27  (  70.36, 146.33)   55.48                69