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   ( -71.95, 160.78) 05/06/2021   13:01:59  ( -71.86, 163.34)   89.04                66
 05/06/2021   13:51:22   (  71.08, -30.35) 05/06/2021   13:51:39  (  71.06, -30.33)    2.48                17
 05/06/2021   14:42:03   ( -70.97, 137.16) 05/06/2021   14:41:08  ( -71.00, 137.20)    3.16                55
 05/09/2021   06:07:41   (  71.06,  85.62) 05/09/2021   06:08:06  (  71.07,  85.56)    2.40                25
 05/09/2021   06:58:23   ( -71.01,-106.96) 05/09/2021   06:57:35  ( -71.01,-106.90)    2.05                48
 05/11/2021   22:24:01   (  71.10,-158.50) 05/11/2021   22:24:32  (  71.12,-158.47)    2.89                31
 05/11/2021   23:14:42   ( -70.99,   9.01) 05/11/2021   23:14:02  ( -71.01,   8.99)    2.56                40
 05/14/2021   14:40:21   (  71.14, -42.63) 05/14/2021   14:40:59  (  71.12, -42.59)    2.14                38
 05/14/2021   15:31:02   ( -71.03, 124.88) 05/14/2021   15:30:29  ( -71.01, 124.87)    1.80                33
 05/17/2021   06:56:39   (  71.13,  73.33) 05/17/2021   06:57:25  (  71.12,  73.28)    2.22                46
 05/17/2021   07:47:21   ( -71.07,-119.25) 05/17/2021   07:46:54  ( -71.06,-119.17)    3.00                27