Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 9 30.  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)
 10/01/2021   02:43:40   ( -72.21, -44.32) 10/01/2021   02:44:46  ( -72.08, -41.65)   92.10                66
 10/01/2021   03:34:08   (  71.28, 124.71) 10/01/2021   03:34:26  (  71.29, 124.66)    2.51                18
 10/01/2021   04:24:50   ( -71.24, -67.89) 10/01/2021   04:23:55  ( -71.23, -67.82)    3.14                55
 10/03/2021   19:50:26   (  71.30,-119.37) 10/03/2021   19:50:56  (  71.30,-119.46)    3.02                30
 10/03/2021   20:41:08   ( -71.26,  48.02) 10/03/2021   20:40:25  ( -71.23,  48.07)    3.09                43
 10/06/2021   12:06:44   (  71.32,  -3.47) 10/06/2021   12:07:25  (  71.35,  -3.50)    3.15                41
 10/06/2021   12:57:24   ( -71.23, 164.03) 10/06/2021   12:56:54  ( -71.24, 163.95)    2.96                30
 10/09/2021   04:23:01   (  71.35, 112.44) 10/09/2021   04:23:54  (  71.34, 112.37)    2.51                53
 10/09/2021   05:13:43   ( -71.30, -80.15) 10/09/2021   05:13:23  ( -71.29, -80.09)    2.72                20
 10/09/2021   06:04:10   (  70.31,  88.81) 10/09/2021   06:03:05  (  70.37,  86.14)   99.95                65
 10/11/2021   20:39:19   (  71.38,-131.67) 10/11/2021   20:40:23  (  71.38,-131.69)    0.89                64
 10/11/2021   21:30:00   ( -71.27,  35.84) 10/11/2021   21:29:53  ( -71.27,  35.77)    2.64                 7
 10/11/2021   22:20:36   (  70.76,-155.97) 10/11/2021   22:19:26  (  70.85,-157.26)   48.16                70