Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 12 17.  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)
 12/19/2019   13:52:04   ( -70.44, 148.77) 12/19/2019   13:52:40  ( -70.45, 148.83)    2.35                36
 12/19/2019   14:42:48   (  70.35, -43.76) 12/19/2019   14:42:07  (  70.35, -43.68)    3.00                41
 12/22/2019   06:08:29   ( -70.43, -95.31) 12/22/2019   06:09:09  ( -70.43, -95.33)    0.82                40
 12/22/2019   06:59:13   (  70.33,  72.16) 12/22/2019   06:58:36  (  70.32,  72.15)    1.66                37
 12/24/2019   22:24:54   ( -70.47,  20.53) 12/24/2019   22:25:36  ( -70.45,  20.59)    2.98                42
 12/24/2019   23:15:37   (  70.32,-171.92) 12/24/2019   23:15:03  (  70.34,-171.93)    2.28                34
 12/27/2019   14:41:19   ( -70.46, 136.44) 12/27/2019   14:42:04  ( -70.47, 136.50)    2.56                45
 12/27/2019   15:32:03   (  70.36, -56.09) 12/27/2019   15:31:31  (  70.35, -56.03)    2.32                32
 12/30/2019   06:57:44   ( -70.45,-107.64) 12/30/2019   06:58:33  ( -70.43,-107.68)    2.19                49
 12/30/2019   07:48:28   (  70.35,  59.83) 12/30/2019   07:47:59  (  70.37,  59.87)    2.88                29