Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 4 17.  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)
 04/17/2021   19:06:21   ( -71.03,  70.88) 04/17/2021   19:07:04  ( -71.06,  70.87)    3.62                43
 04/17/2021   19:57:05   (  70.96,-121.69) 04/17/2021   19:56:31  (  70.96,-121.64)    2.04                34
 04/20/2021   11:22:40   ( -71.04,-173.21) 04/20/2021   11:23:31  ( -71.05,-173.26)    2.51                51
 04/20/2021   12:13:24   (  70.97,  -5.77) 04/20/2021   12:12:58  (  70.95,  -5.78)    2.21                26
 04/23/2021   03:39:01   ( -71.10, -57.38) 04/23/2021   03:39:58  ( -71.09, -57.32)    2.36                57
 04/23/2021   04:29:44   (  70.98, 110.14) 04/23/2021   04:29:25  (  70.99, 110.16)    0.89                19
 04/23/2021   05:20:14   ( -70.27, -81.38) 04/23/2021   05:19:05  ( -70.33, -83.19)   68.35                69
 04/25/2021   19:55:21   ( -71.12,  58.54) 04/25/2021   19:56:25  ( -71.13,  58.61)    3.16                64
 04/25/2021   20:46:04   (  70.99,-133.94) 04/25/2021   20:45:52  (  71.02,-133.91)    3.27                12
 04/25/2021   21:36:39   ( -70.54,  34.12) 04/25/2021   21:35:28  ( -70.59,  33.06)   39.46                71
 04/28/2021   12:11:41   ( -71.13, 174.45) 04/28/2021   12:12:53  ( -71.11, 174.46)    2.55                72
 04/28/2021   13:02:24   (  71.00, -18.02) 04/28/2021   13:02:20  (  70.99, -18.07)    2.06                 4
 04/28/2021   13:53:04   ( -70.82, 149.61) 04/28/2021   13:51:51  ( -70.84, 149.32)   10.73                73