Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 12 24.  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   04:17:09   ( -70.78, -67.05) 12/26/2020   04:17:50  ( -70.75, -67.04)    2.99                41
 12/26/2020   05:07:52   (  70.64, 100.49) 12/26/2020   05:07:17  (  70.65, 100.45)    2.24                35
 12/28/2020   20:33:30   ( -70.77,  48.89) 12/28/2020   20:34:18  ( -70.77,  48.87)    0.68                48
 12/28/2020   21:24:14   (  70.68,-143.65) 12/28/2020   21:23:45  (  70.67,-143.65)    1.75                29
 12/31/2020   12:49:51   ( -70.77, 164.82) 12/31/2020   12:50:46  ( -70.78, 164.77)    2.60                55
 12/31/2020   13:40:35   (  70.68, -27.72) 12/31/2020   13:40:13  (  70.68, -27.75)    1.10                22
 12/31/2020   14:31:03   ( -69.88, 140.86) 12/31/2020   14:29:55  ( -69.91, 138.78)   79.65                68
 01/03/2021   05:06:13   ( -70.82, -79.34) 01/03/2021   05:07:14  ( -70.79, -79.34)    2.90                61
 01/03/2021   05:56:55   (  70.67,  88.21) 01/03/2021   05:56:40  (  70.68,  88.14)    2.70                15
 01/03/2021   06:47:28   ( -70.14,-103.62) 01/03/2021   06:46:18  ( -70.14,-105.02)   53.07                70
 01/05/2021   21:22:33   ( -70.82,  36.59) 01/05/2021   21:23:41  ( -70.79,  36.55)    3.12                68
 01/05/2021   22:13:17   (  70.73,-155.95) 01/05/2021   22:13:07  (  70.74,-155.89)    2.27                10
 01/05/2021   23:03:53   ( -70.35,  11.98) 01/05/2021   23:02:41  ( -70.42,  11.26)   27.84                72