Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 3 27.  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)
 03/27/2021   08:05:00   (  71.01,  56.12) 03/27/2021   08:05:54  (  71.00,  56.13)    1.28                54
 03/27/2021   08:55:42   ( -70.91,-136.40) 03/27/2021   08:55:24  ( -70.88,-136.41)    3.44                18
 03/27/2021   09:46:11   (  70.07,  32.27) 03/27/2021   09:45:04  (  70.07,  30.03)   84.89                67
 03/30/2021   00:21:20   (  71.01, 172.05) 03/30/2021   00:22:22  (  71.02, 172.04)    1.30                62
 03/30/2021   01:12:02   ( -70.91, -20.46) 03/30/2021   01:11:52  ( -70.91, -20.50)    1.20                10
 03/30/2021   02:02:36   (  70.33, 147.79) 03/30/2021   02:01:26  (  70.42, 146.42)   52.48                70
 04/01/2021   16:37:39   (  71.01, -72.02) 04/01/2021   16:38:49  (  71.04, -72.05)    3.10                70
 04/01/2021   17:28:21   ( -70.91,  95.47) 04/01/2021   17:28:19  ( -70.93,  95.41)    2.95                 2
 04/01/2021   18:19:01   (  70.65, -96.78) 04/01/2021   18:17:48  (  70.71, -97.27)   19.54                73
 04/04/2021   08:54:04   (  71.28,  43.46) 04/04/2021   08:55:15  (  71.16,  44.01)   23.83                71
 04/04/2021   09:44:42   ( -70.96,-148.69) 04/04/2021   09:44:47  ( -70.94,-148.69)    2.44                 5
 04/04/2021   10:35:25   (  70.86,  18.80) 04/04/2021   10:34:14  (  70.83,  18.79)    3.11                71
 04/07/2021   01:10:29   (  71.54, 158.92) 04/07/2021   01:11:38  (  71.43, 160.34)   51.30                69
 04/07/2021   02:01:02   ( -70.97, -32.76) 04/07/2021   02:01:15  ( -70.95, -32.80)    2.52                13
 04/07/2021   02:51:45   (  70.87, 134.73) 04/07/2021   02:50:41  (  70.89, 134.75)    3.11                64
 04/09/2021   17:26:54   (  71.80, -85.63) 04/09/2021   17:28:01  (  71.70, -83.34)   80.58                67
 04/09/2021   18:17:22   ( -70.97,  83.16) 04/09/2021   18:17:42  ( -71.01,  83.16)    3.50                20
 04/09/2021   19:08:04   (  70.87,-109.35) 04/09/2021   19:07:08  (  70.89,-109.37)    2.12                56