Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 12 20.  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)
 12/22/2019   06:08:28   ( -70.42, -95.29) 12/22/2019   06:09:08  ( -70.43, -95.33)    1.99                40
 12/22/2019   06:59:12   (  70.32,  72.18) 12/22/2019   06:58:35  (  70.32,  72.16)    0.95                37
 12/24/2019   22:24:54   ( -70.45,  20.55) 12/24/2019   22:25:36  ( -70.45,  20.59)    1.48                42
 12/24/2019   23:15:38   (  70.35,-171.98) 12/24/2019   23:15:03  (  70.34,-171.93)    2.35                35
 12/27/2019   14:41:19   ( -70.44, 136.47) 12/27/2019   14:42:04  ( -70.47, 136.49)    3.22                45
 12/27/2019   15:32:03   (  70.34, -56.06) 12/27/2019   15:31:31  (  70.35, -56.03)    2.20                32
 12/30/2019   06:57:44   ( -70.43,-107.61) 12/30/2019   06:58:33  ( -70.43,-107.69)    2.75                49
 12/30/2019   07:48:28   (  70.32,  59.86) 12/30/2019   07:48:00  (  70.31,  59.79)    3.20                28
 01/01/2020   23:14:09   ( -70.47,   8.22) 01/01/2020   23:14:59  ( -70.49,   8.29)    3.15                50
 01/02/2020   00:04:53   (  70.36, 175.69) 01/02/2020   00:04:26  (  70.37, 175.76)    2.41                27