Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 16.  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   05:12:05   (  71.97,  99.14) 10/17/2021   05:13:13  (  71.86, 100.86)   60.97                68
 10/17/2021   06:02:36   ( -71.36, -92.41) 10/17/2021   06:02:50  ( -71.36, -92.34)    2.59                14
 10/17/2021   06:53:20   (  71.26,  75.08) 10/17/2021   06:52:17  (  71.27,  75.16)    3.29                63
 10/19/2021   22:18:52   ( -71.34,  23.57) 10/19/2021   22:19:19  ( -71.33,  23.49)    3.24                27
 10/19/2021   23:09:36   (  71.24,-168.95) 10/19/2021   23:08:46  (  71.24,-169.02)    2.66                50
 10/22/2021   14:35:10   ( -71.38, 139.45) 10/22/2021   14:35:47  ( -71.40, 139.48)    2.48                37
 10/22/2021   15:25:54   (  71.29, -53.07) 10/22/2021   15:25:14  (  71.30, -53.03)    2.35                40
 10/25/2021   06:51:28   ( -71.42,-104.67) 10/25/2021   06:52:16  ( -71.41,-104.62)    1.99                48
 10/25/2021   07:42:11   (  71.28,  62.89) 10/25/2021   07:41:43  (  71.31,  62.86)    3.25                28
 10/27/2021   23:07:45   ( -71.41,  11.30) 10/27/2021   23:08:45  ( -71.41,  11.27)    1.09                60
 10/27/2021   23:58:29   (  71.33, 178.75) 10/27/2021   23:58:12  (  71.31, 178.75)    2.32                17