Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 12 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)
 12/16/2019   21:35:38   ( -70.41,  32.93) 12/16/2019   21:36:12  ( -70.42,  32.90)    1.28                34
 12/16/2019   22:26:22   (  70.32,-159.61) 12/16/2019   22:25:39  (  70.31,-159.61)    0.47                43
 12/19/2019   13:52:04   ( -70.45, 148.77) 12/19/2019   13:52:40  ( -70.45, 148.83)    2.35                36
 12/19/2019   14:42:47   (  70.30, -43.69) 12/19/2019   14:42:08  (  70.29, -43.77)    3.19                39
 12/22/2019   06:08:29   ( -70.43, -95.32) 12/22/2019   06:09:09  ( -70.43, -95.33)    1.01                40
 12/22/2019   06:59:13   (  70.34,  72.15) 12/22/2019   06:58:36  (  70.31,  72.15)    2.58                37
 12/24/2019   22:24:54   ( -70.42,  20.60) 12/24/2019   22:25:37  ( -70.45,  20.59)    3.31                43
 12/24/2019   23:15:38   (  70.32,-171.93) 12/24/2019   23:15:04  (  70.34,-171.93)    1.43                34
 12/27/2019   14:41:19   ( -70.46, 136.43) 12/27/2019   14:42:04  ( -70.47, 136.51)    2.94                45
 12/27/2019   15:32:03   (  70.37, -56.10) 12/27/2019   15:31:31  (  70.36, -56.02)    3.14                32