Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 12 26.  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)
 12/26/2020   04:17:08   ( -70.74, -66.99) 12/26/2020   04:17:50  ( -70.74, -67.06)    2.81                42
 12/26/2020   05:07:52   (  70.65, 100.47) 12/26/2020   05:07:17  (  70.64, 100.43)    1.94                35
 12/28/2020   20:33:30   ( -70.78,  48.87) 12/28/2020   20:34:18  ( -70.76,  48.85)    3.08                48
 12/28/2020   21:24:13   (  70.64,-143.59) 12/28/2020   21:23:45  (  70.65,-143.66)    3.36                28
 12/31/2020   12:49:51   ( -70.78, 164.80) 12/31/2020   12:50:46  ( -70.77, 164.75)    2.02                55
 12/31/2020   13:40:35   (  70.69, -27.74) 12/31/2020   13:40:13  (  70.67, -27.77)    2.51                22
 12/31/2020   14:31:02   ( -69.84, 140.92) 12/31/2020   14:29:55  ( -69.90, 138.76)   83.02                67
 01/03/2021   05:06:13   ( -70.83, -79.35) 01/03/2021   05:07:13  ( -70.83, -79.27)    3.12                60
 01/03/2021   05:56:56   (  70.68,  88.20) 01/03/2021   05:56:41  (  70.67,  88.13)    2.92                15
 01/03/2021   06:47:28   ( -70.10,-103.55) 01/03/2021   06:46:18  ( -70.18,-104.96)   54.10                70
 01/05/2021   21:22:33   ( -70.83,  36.57) 01/05/2021   21:23:40  ( -70.84,  36.62)    1.86                67
 01/05/2021   22:13:17   (  70.73,-155.96) 01/05/2021   22:13:07  (  70.73,-155.91)    2.08                10
 01/05/2021   23:03:53   ( -70.36,  11.97) 01/05/2021   23:02:41  ( -70.40,  11.24)   27.44                72
 01/08/2021   13:38:56   ( -70.93, 152.32) 01/08/2021   13:40:07  ( -70.89, 152.58)   10.63                71
 01/08/2021   14:29:38   (  70.74, -40.04) 01/08/2021   14:29:35  (  70.72, -40.03)    1.56                 3
 01/08/2021   15:20:18   ( -70.57, 127.55) 01/08/2021   15:19:05  ( -70.62, 127.45)    6.81                73