Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 12 19.  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, 148.78) 12/19/2019   13:52:40  ( -70.45, 148.83)    2.41                36
 12/19/2019   14:42:48   (  70.34, -43.75) 12/19/2019   14:42:07  (  70.35, -43.68)    2.91                41
 12/22/2019   06:08:29   ( -70.42, -95.30) 12/22/2019   06:09:09  ( -70.43, -95.33)    1.38                40
 12/22/2019   06:59:13   (  70.32,  72.17) 12/22/2019   06:58:36  (  70.32,  72.16)    0.76                37
 12/24/2019   22:24:54   ( -70.46,  20.54) 12/24/2019   22:25:36  ( -70.45,  20.58)    1.86                42
 12/24/2019   23:15:38   (  70.36,-171.99) 12/24/2019   23:15:03  (  70.34,-171.94)    2.95                35
 12/27/2019   14:41:19   ( -70.44, 136.46) 12/27/2019   14:42:04  ( -70.47, 136.49)    2.75                45
 12/27/2019   15:32:03   (  70.34, -56.06) 12/27/2019   15:31:31  (  70.35, -56.03)    1.70                32
 12/30/2019   06:57:44   ( -70.43,-107.62) 12/30/2019   06:58:33  ( -70.42,-107.69)    2.78                49
 12/30/2019   07:48:28   (  70.33,  59.86) 12/30/2019   07:48:00  (  70.31,  59.79)    3.40                28
 01/01/2020   23:14:10   ( -70.47,   8.22) 01/01/2020   23:15:00  ( -70.49,   8.29)    3.24                50
 01/02/2020   00:04:54   (  70.36, 175.69) 01/02/2020   00:04:27  (  70.37, 175.76)    2.36                27