Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 4 15.  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)
 04/15/2021   03:40:44   (  70.92, 122.44) 04/15/2021   03:40:04  (  70.89, 122.38)    3.28                40
 04/17/2021   19:06:21   ( -71.05,  70.84) 04/17/2021   19:07:04  ( -71.04,  70.85)    0.57                43
 04/17/2021   19:57:04   (  70.93,-121.64) 04/17/2021   19:56:31  (  70.94,-121.67)    1.75                33
 04/20/2021   11:22:41   ( -71.06,-173.24) 04/20/2021   11:23:31  ( -71.09,-173.21)    3.22                50
 04/20/2021   12:13:24   (  70.94,  -5.73) 04/20/2021   12:12:59  (  70.93,  -5.81)    3.36                25
 04/23/2021   03:39:01   ( -71.08, -57.33) 04/23/2021   03:39:59  ( -71.07, -57.35)    0.64                58
 04/23/2021   04:29:44   (  70.96, 110.18) 04/23/2021   04:29:26  (  70.97, 110.13)    2.29                18
 04/23/2021   05:20:15   ( -70.30, -81.42) 04/23/2021   05:19:06  ( -70.31, -83.22)   67.40                69
 04/25/2021   19:55:20   ( -71.10,  58.57) 04/25/2021   19:56:25  ( -71.11,  58.59)    1.72                65
 04/25/2021   20:46:03   (  70.97,-133.91) 04/25/2021   20:45:52  (  71.00,-133.94)    3.09                11
 04/25/2021   21:36:38   ( -70.52,  34.15) 04/25/2021   21:35:27  ( -70.62,  33.12)   39.93                71
 04/28/2021   12:11:41   ( -71.17, 174.39) 04/28/2021   12:12:52  ( -71.14, 174.51)    5.38                71
 04/28/2021   13:02:24   (  71.04, -18.09) 04/28/2021   13:02:19  (  71.03, -18.02)    3.16                 5
 04/28/2021   13:53:03   ( -70.80, 149.63) 04/28/2021   13:51:50  ( -70.87, 149.37)   12.03                73