Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 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)
 10/17/2021   05:12:04   (  71.95,  99.19) 10/17/2021   05:13:13  (  71.84, 100.82)   57.61                69
 10/17/2021   06:02:35   ( -71.33, -92.36) 10/17/2021   06:02:50  ( -71.34, -92.38)    1.08                15
 10/17/2021   06:53:19   (  71.23,  75.13) 10/17/2021   06:52:17  (  71.25,  75.12)    2.12                62
 10/19/2021   22:18:53   ( -71.36,  23.54) 10/19/2021   22:19:19  ( -71.36,  23.54)    0.34                26
 10/19/2021   23:09:37   (  71.27,-168.98) 10/19/2021   23:08:46  (  71.26,-168.97)    0.48                51
 10/22/2021   14:35:11   ( -71.40, 139.42) 10/22/2021   14:35:48  ( -71.37, 139.44)    2.55                37
 10/22/2021   15:25:54   (  71.25, -53.02) 10/22/2021   15:25:15  (  71.28, -53.07)    3.16                39
 10/25/2021   06:51:27   ( -71.38,-104.60) 10/25/2021   06:52:16  ( -71.38,-104.66)    2.08                49
 10/25/2021   07:42:11   (  71.30,  62.86) 10/25/2021   07:41:43  (  71.28,  62.82)    2.26                28
 10/27/2021   23:07:45   ( -71.42,  11.28) 10/27/2021   23:08:44  ( -71.44,  11.31)    2.37                59
 10/27/2021   23:58:29   (  71.35, 178.72) 10/27/2021   23:58:11  (  71.34, 178.79)    2.51                18