Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 14.  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)
 07/15/2021   07:27:44   ( -71.22,-114.16) 07/15/2021   07:28:53  ( -71.20,-114.17)    1.87                69
 07/15/2021   08:18:27   (  71.10,  53.35) 07/15/2021   08:18:20  (  71.11,  53.32)    1.05                 7
 07/15/2021   09:09:05   ( -70.80,-138.83) 07/15/2021   09:07:52  ( -70.88,-139.40)   22.25                73
 07/17/2021   23:44:08   ( -71.49,   1.29) 07/17/2021   23:45:19  ( -71.37,   1.98)   28.16                71
 07/18/2021   00:34:46   (  71.12, 169.25) 07/18/2021   00:34:49  (  71.10, 169.21)    2.69                 3
 07/18/2021   01:25:28   ( -71.03, -23.27) 07/18/2021   01:24:18  ( -71.05, -23.25)    1.92                70
 07/20/2021   16:00:33   ( -71.82, 116.64) 07/20/2021   16:01:42  ( -71.69, 118.40)   63.22                69
 07/20/2021   16:51:05   (  71.15, -74.85) 07/20/2021   16:51:17  (  71.15, -74.83)    0.99                12
 07/20/2021   17:41:47   ( -71.05,  92.64) 07/20/2021   17:40:47  ( -71.05,  92.63)    0.47                60
 07/23/2021   09:07:23   (  71.17,  41.05) 07/23/2021   09:07:45  (  71.15,  41.04)    2.89                22
 07/23/2021   09:58:05   ( -71.07,-151.45) 07/23/2021   09:57:15  ( -71.04,-151.49)    3.28                50
 07/26/2021   01:23:42   (  71.20, 156.95) 07/26/2021   01:24:13  (  71.19, 157.00)    1.84                31
 07/26/2021   02:14:24   ( -71.09, -35.54) 07/26/2021   02:13:43  ( -71.09, -35.53)    0.38                41