Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 3.  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)
 10/03/2021   19:50:26   (  71.34,-119.44) 10/03/2021   19:50:55  (  71.32,-119.43)    2.26                29
 10/03/2021   20:41:07   ( -71.25,  48.05) 10/03/2021   20:40:24  ( -71.25,  48.09)    1.71                43
 10/06/2021   12:06:44   (  71.36,  -3.53) 10/06/2021   12:07:24  (  71.37,  -3.47)    2.24                40
 10/06/2021   12:57:25   ( -71.26, 163.96) 10/06/2021   12:56:54  ( -71.25, 163.97)    1.81                31
 10/09/2021   04:23:02   (  71.38, 112.38) 10/09/2021   04:23:54  (  71.36, 112.39)    2.92                52
 10/09/2021   05:13:43   ( -71.29, -80.13) 10/09/2021   05:13:23  ( -71.30, -80.07)    2.26                20
 10/09/2021   06:04:11   (  70.34,  88.75) 10/09/2021   06:03:05  (  70.38,  86.16)   96.96                66
 10/11/2021   20:39:20   (  71.41,-131.72) 10/11/2021   20:40:23  (  71.40,-131.67)    2.62                63
 10/11/2021   21:30:01   ( -71.31,  35.78) 10/11/2021   21:29:53  ( -71.28,  35.78)    2.79                 8
 10/11/2021   22:20:37   (  70.79,-156.03) 10/11/2021   22:19:27  (  70.80,-157.33)   47.66                70
 10/14/2021   12:55:39   (  71.54, -16.01) 10/14/2021   12:56:50  (  71.48, -15.65)   14.75                71
 10/14/2021   13:46:18   ( -71.33, 151.68) 10/14/2021   13:46:21  ( -71.32, 151.72)    2.17                 3
 10/14/2021   14:37:01   (  71.19, -40.75) 10/14/2021   14:35:48  (  71.22, -40.80)    3.74                73