Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 5.  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)
 05/06/2021   13:00:53   ( -71.92, 160.84) 05/06/2021   13:02:00  ( -71.84, 163.30)   85.72                67
 05/06/2021   13:51:22   (  71.05, -30.29) 05/06/2021   13:51:40  (  71.04, -30.36)    2.80                18
 05/06/2021   14:42:04   ( -70.99, 137.13) 05/06/2021   14:41:09  ( -70.98, 137.17)    2.34                55
 05/09/2021   06:07:42   (  71.08,  85.59) 05/09/2021   06:08:06  (  71.10,  85.61)    2.02                24
 05/09/2021   06:58:22   ( -70.97,-106.90) 05/09/2021   06:57:35  ( -70.99,-106.93)    1.83                47
 05/11/2021   22:24:01   (  71.12,-158.53) 05/11/2021   22:24:32  (  71.10,-158.51)    2.18                31
 05/11/2021   23:14:42   ( -71.01,   8.98) 05/11/2021   23:14:02  ( -70.99,   8.95)    2.19                40
 05/14/2021   14:40:20   (  71.11, -42.57) 05/14/2021   14:40:59  (  71.10, -42.63)    2.20                39
 05/14/2021   15:31:02   ( -71.05, 124.85) 05/14/2021   15:30:28  ( -71.05, 124.92)    2.60                34
 05/17/2021   06:56:40   (  71.15,  73.29) 05/17/2021   06:57:25  (  71.15,  73.33)    1.19                45
 05/17/2021   07:47:21   ( -71.04,-119.20) 05/17/2021   07:46:55  ( -71.04,-119.21)    0.53                26