Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 15.  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   08:18:27   (  71.12,  53.32) 07/15/2021   08:18:19  (  71.14,  53.38)    3.42                 8
 07/15/2021   09:09:04   ( -70.77,-138.77) 07/15/2021   09:07:52  ( -70.86,-139.43)   25.88                72
 07/17/2021   23:44:07   ( -71.46,   1.35) 07/17/2021   23:45:19  ( -71.35,   1.95)   24.51                72
 07/18/2021   00:34:46   (  71.14, 169.22) 07/18/2021   00:34:48  (  71.14, 169.26)    1.51                 2
 07/18/2021   01:25:28   ( -71.05, -23.30) 07/18/2021   01:24:18  ( -71.03, -23.28)    2.35                70
 07/20/2021   16:00:33   ( -71.84, 116.60) 07/20/2021   16:01:41  ( -71.72, 118.46)   65.81                68
 07/20/2021   16:51:05   (  71.17, -74.88) 07/20/2021   16:51:17  (  71.14, -74.86)    3.23                12
 07/20/2021   17:41:47   ( -71.07,  92.61) 07/20/2021   17:40:46  ( -71.08,  92.69)    3.10                61
 07/23/2021   09:07:24   (  71.19,  41.02) 07/23/2021   09:07:45  (  71.18,  41.10)    2.84                21
 07/23/2021   09:58:06   ( -71.08,-151.48) 07/23/2021   09:57:15  ( -71.08,-151.44)    1.83                51
 07/26/2021   01:23:41   (  71.16, 157.01) 07/26/2021   01:24:13  (  71.17, 156.97)    1.85                32
 07/26/2021   02:14:23   ( -71.05, -35.48) 07/26/2021   02:13:43  ( -71.07, -35.56)    3.27                40
 07/28/2021   17:40:00   (  71.19, -87.09) 07/28/2021   17:40:41  (  71.21, -87.09)    2.10                41
 07/28/2021   18:30:43   ( -71.13,  80.33) 07/28/2021   18:30:11  ( -71.11,  80.39)    3.04                32