Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 19.  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)
 10/19/2021   22:18:53   ( -71.37,  23.52) 10/19/2021   22:19:19  ( -71.35,  23.52)    2.64                26
 10/19/2021   23:09:37   (  71.27,-169.00) 10/19/2021   23:08:46  (  71.26,-168.98)    1.39                51
 10/22/2021   14:35:10   ( -71.36, 139.49) 10/22/2021   14:35:48  ( -71.36, 139.43)    2.61                38
 10/22/2021   15:25:54   (  71.26, -53.03) 10/22/2021   15:25:15  (  71.27, -53.08)    2.24                39
 10/25/2021   06:51:28   ( -71.40,-104.62) 10/25/2021   06:52:17  ( -71.37,-104.68)    3.11                49
 10/25/2021   07:42:12   (  71.31,  62.84) 10/25/2021   07:41:43  (  71.33,  62.90)    3.30                29
 10/27/2021   23:07:45   ( -71.44,  11.25) 10/27/2021   23:08:44  ( -71.43,  11.29)    1.64                59
 10/27/2021   23:58:28   (  71.30, 178.80) 10/27/2021   23:58:11  (  71.33, 178.78)    3.16                17
 10/28/2021   00:48:59   ( -70.66, -12.79) 10/28/2021   00:47:50  ( -70.73, -14.53)   64.43                69
 10/30/2021   15:24:02   ( -71.43, 127.22) 10/30/2021   15:25:13  ( -71.43, 127.17)    1.73                71
 10/30/2021   16:14:46   (  71.35, -65.34) 10/30/2021   16:14:39  (  71.38, -65.27)    3.52                 7
 10/30/2021   17:05:24   ( -71.07, 102.47) 10/30/2021   17:04:11  ( -71.16, 102.02)   18.96                73