Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 21.  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)
 12/22/2021   17:21:16   ( -71.68,  97.89) 12/22/2021   17:22:27  ( -71.64,  98.16)   10.37                71
 12/22/2021   18:11:59   (  71.50, -94.47) 12/22/2021   18:11:55  (  71.49, -94.45)    1.23                 4
 12/22/2021   19:02:39   ( -71.24,  73.30) 12/22/2021   19:01:26  ( -71.32,  72.91)   16.33                73
 12/25/2021   08:48:25   (  71.57,  46.31) 12/25/2021   08:49:28  (  71.60,  46.33)    2.51                63
 12/25/2021   09:39:08   ( -71.47,-146.19) 12/25/2021   09:38:58  ( -71.48,-146.22)    2.19                10
 12/25/2021   10:29:43   (  70.87,  22.15) 12/25/2021   10:28:34  (  70.89,  20.48)   60.86                69
 12/28/2021   00:15:35   ( -71.59,  -5.49) 12/28/2021   00:16:31  ( -71.58,  -5.46)    1.61                56
 12/28/2021   01:06:19   (  71.47, 162.03) 12/28/2021   01:05:58  (  71.48, 162.02)    0.64                21
 12/28/2021   01:56:48   ( -70.63, -29.22) 12/28/2021   01:55:41  ( -70.66, -31.64)   89.19                67
 12/30/2021   15:42:45   (  71.55, -57.20) 12/30/2021   15:43:31  (  71.56, -57.24)    1.75                46
 12/30/2021   16:33:29   ( -71.48, 110.24) 12/30/2021   16:33:01  ( -71.45, 110.21)    3.46                28
 01/02/2022   07:09:54   ( -71.56,-108.98) 01/02/2022   07:10:32  ( -71.58,-108.97)    2.77                38
 01/02/2022   08:00:38   (  71.45,  58.52) 01/02/2022   07:59:59  (  71.47,  58.50)    2.65                39