Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 12.  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)
 07/12/2021   15:11:25   ( -71.18, 129.95) 07/12/2021   15:12:24  ( -71.21, 129.96)    3.18                59
 07/12/2021   16:02:09   (  71.11, -62.62) 07/12/2021   16:01:51  (  71.12, -62.54)    2.77                18
 07/12/2021   16:52:40   ( -70.46, 105.79) 07/12/2021   16:51:30  ( -70.51, 104.16)   61.08                70
 07/15/2021   07:27:44   ( -71.20,-114.13) 07/15/2021   07:28:53  ( -71.22,-114.14)    2.27                69
 07/15/2021   08:18:28   (  71.14,  53.29) 07/15/2021   08:18:20  (  71.12,  53.35)    2.79                 8
 07/15/2021   09:09:05   ( -70.79,-138.80) 07/15/2021   09:07:53  ( -70.84,-139.45)   24.68                72
 07/17/2021   23:44:07   ( -71.47,   1.32) 07/17/2021   23:45:18  ( -71.38,   2.01)   26.27                71
 07/18/2021   00:34:45   (  71.11, 169.28) 07/18/2021   00:34:48  (  71.12, 169.23)    2.23                 3
 07/18/2021   01:25:27   ( -71.01, -23.24) 07/18/2021   01:24:18  ( -71.01, -23.31)    2.72                69
 07/20/2021   16:00:32   ( -71.80, 116.67) 07/20/2021   16:01:41  ( -71.70, 118.43)   62.21                69
 07/20/2021   16:51:04   (  71.13, -74.82) 07/20/2021   16:51:17  (  71.11, -74.90)    3.53                13
 07/20/2021   17:41:46   ( -71.03,  92.67) 07/20/2021   17:40:46  ( -71.06,  92.65)    3.45                60
 07/23/2021   09:07:23   (  71.16,  41.08) 07/23/2021   09:07:45  (  71.16,  41.06)    0.82                22
 07/23/2021   09:58:05   ( -71.05,-151.42) 07/23/2021   09:57:15  ( -71.05,-151.47)    1.97                50
 07/26/2021   01:23:42   (  71.18, 156.98) 07/26/2021   01:24:13  (  71.19, 157.01)    1.66                31
 07/26/2021   02:14:24   ( -71.07, -35.51) 07/26/2021   02:13:43  ( -71.09, -35.52)    2.55                41