Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 12 31.  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)
 12/31/2020   12:49:51   ( -70.77, 164.81) 12/31/2020   12:50:46  ( -70.78, 164.76)    2.02                55
 12/31/2020   13:40:35   (  70.67, -27.71) 12/31/2020   13:40:13  (  70.68, -27.75)    1.45                22
 12/31/2020   14:31:03   ( -69.88, 140.85) 12/31/2020   14:29:55  ( -69.91, 138.76)   79.74                68
 01/03/2021   05:06:13   ( -70.82, -79.34) 01/03/2021   05:07:13  ( -70.84, -79.27)    3.49                60
 01/03/2021   05:56:56   (  70.67,  88.22) 01/03/2021   05:56:41  (  70.68,  88.14)    3.47                15
 01/03/2021   06:47:28   ( -70.09,-103.54) 01/03/2021   06:46:18  ( -70.19,-104.95)   54.69                70
 01/05/2021   21:22:33   ( -70.82,  36.59) 01/05/2021   21:23:40  ( -70.84,  36.62)    2.85                67
 01/05/2021   22:13:17   (  70.72,-155.93) 01/05/2021   22:13:07  (  70.74,-155.90)    2.55                10
 01/05/2021   23:03:53   ( -70.35,  11.98) 01/05/2021   23:02:41  ( -70.41,  11.25)   28.30                72
 01/08/2021   13:38:56   ( -70.92, 152.34) 01/08/2021   13:40:07  ( -70.89, 152.58)    9.16                71
 01/08/2021   14:29:38   (  70.72, -40.00) 01/08/2021   14:29:35  (  70.73, -40.02)    1.73                 3
 01/08/2021   15:20:18   ( -70.56, 127.58) 01/08/2021   15:19:06  ( -70.57, 127.37)    7.88                72
 01/11/2021   05:55:21   ( -71.13, -92.08) 01/11/2021   05:56:32  ( -71.04, -91.30)   29.83                71
 01/11/2021   06:45:59   (  70.72,  75.92) 01/11/2021   06:46:03  (  70.72,  75.84)    3.01                 4
 01/11/2021   07:36:41   ( -70.66,-116.67) 01/11/2021   07:35:32  ( -70.67,-116.60)    2.49                69
 01/13/2021   22:11:46   ( -71.34,  23.48) 01/13/2021   22:12:56  ( -71.24,  24.90)   51.93                70
 01/13/2021   23:02:21   (  70.77,-168.24) 01/13/2021   23:02:30  (  70.75,-168.22)    2.22                 9
 01/13/2021   23:53:01   ( -70.66,  -0.74) 01/13/2021   23:51:59  ( -70.65,  -0.74)    1.56                62