Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 12 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)
 12/28/2020   20:33:30   ( -70.76,  48.91) 12/28/2020   20:34:18  ( -70.79,  48.89)    3.41                48
 12/28/2020   21:24:14   (  70.66,-143.62) 12/28/2020   21:23:45  (  70.68,-143.62)    2.55                29
 12/31/2020   12:49:51   ( -70.80, 164.76) 12/31/2020   12:50:45  ( -70.80, 164.79)    1.13                54
 12/31/2020   13:40:35   (  70.71, -27.77) 12/31/2020   13:40:12  (  70.70, -27.72)    2.20                23
 12/31/2020   14:31:02   ( -69.86, 140.88) 12/31/2020   14:29:54  ( -69.93, 138.80)   80.17                68
 01/03/2021   05:06:12   ( -70.80, -79.30) 01/03/2021   05:07:13  ( -70.81, -79.31)    1.27                61
 01/03/2021   05:56:56   (  70.70,  88.17) 01/03/2021   05:56:40  (  70.70,  88.17)    0.18                16
 01/03/2021   06:47:28   ( -70.12,-103.58) 01/03/2021   06:46:18  ( -70.16,-105.00)   53.66                70
 01/05/2021   21:22:33   ( -70.79,  36.63) 01/05/2021   21:23:41  ( -70.81,  36.57)    2.66                68
 01/05/2021   22:13:17   (  70.70,-155.90) 01/05/2021   22:13:08  (  70.70,-155.95)    1.67                 9
 01/05/2021   23:03:53   ( -70.32,  12.02) 01/05/2021   23:02:41  ( -70.43,  11.28)   29.96                72
 01/08/2021   13:38:56   ( -70.90, 152.38) 01/08/2021   13:40:08  ( -70.86, 152.54)    6.91                72
 01/08/2021   14:29:39   (  70.75, -40.06) 01/08/2021   14:29:35  (  70.75, -39.99)    2.58                 4
 01/08/2021   15:20:19   ( -70.59, 127.53) 01/08/2021   15:19:06  ( -70.59, 127.41)    4.61                73