Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 11 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)
 11/21/2020   07:03:22   ( -71.67,-110.24) 11/21/2020   07:04:27  ( -71.57,-107.43)   99.09                65
 11/21/2020   07:53:48   (  70.68,  58.79) 11/21/2020   07:54:09  (  70.67,  58.78)    1.13                21
 11/21/2020   08:44:30   ( -70.58,-133.73) 11/21/2020   08:43:39  ( -70.55,-133.76)    3.25                51
 11/24/2020   00:10:10   (  70.69, 174.69) 11/24/2020   00:10:38  (  70.71, 174.72)    2.48                28
 11/24/2020   01:00:52   ( -70.59, -17.82) 11/24/2020   01:00:08  ( -70.60, -17.82)    1.10                44
 11/26/2020   16:26:32   (  70.70, -69.41) 11/26/2020   16:27:08  (  70.69, -69.43)    1.52                36
 11/26/2020   17:17:14   ( -70.60,  98.08) 11/26/2020   17:16:38  ( -70.58,  98.04)    2.30                36
 11/29/2020   08:42:54   (  70.72,  46.49) 11/29/2020   08:43:37  (  70.72,  46.49)    0.68                43
 11/29/2020   09:33:36   ( -70.61,-146.02) 11/29/2020   09:33:07  ( -70.62,-146.03)    0.87                29
 12/02/2020   00:59:15   (  70.73, 162.39) 12/02/2020   01:00:05  (  70.75, 162.41)    2.02                50
 12/02/2020   01:49:57   ( -70.63, -30.12) 12/02/2020   01:49:35  ( -70.65, -30.11)    2.39                22
 12/02/2020   02:40:23   (  69.62, 138.74) 12/02/2020   02:39:17  (  69.71, 136.19)   98.98                66
 12/04/2020   17:15:37   (  70.75, -81.72) 12/04/2020   17:16:34  (  70.77, -81.68)    2.71                57
 12/04/2020   18:06:19   ( -70.64,  85.77) 12/04/2020   18:06:04  ( -70.67,  85.80)    3.34                15