Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 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)
 05/22/2021   15:29:26   (  71.57, -55.58) 05/22/2021   15:30:35  (  71.48, -54.25)   47.72                69
 05/22/2021   16:19:59   ( -71.06, 112.65) 05/22/2021   16:20:11  ( -71.04, 112.67)    2.27                12
 05/22/2021   17:10:43   (  70.95, -79.86) 05/22/2021   17:09:38  (  70.94, -79.84)    1.11                65
 05/25/2021   07:45:53   (  71.98,  59.61) 05/25/2021   07:46:59  (  71.84,  62.22)   91.61                66
 05/25/2021   08:36:18   ( -71.05,-131.40) 05/25/2021   08:36:41  ( -71.08,-131.40)    2.91                23
 05/25/2021   09:27:02   (  70.94,  36.09) 05/25/2021   09:26:08  (  70.98,  36.09)    3.71                54
 05/28/2021   00:52:38   ( -71.09, -15.53) 05/28/2021   00:53:11  ( -71.11, -15.47)    2.65                33
 05/28/2021   01:43:22   (  70.99, 151.95) 05/28/2021   01:42:38  (  71.00, 152.01)    2.66                44
 05/30/2021   17:08:57   ( -71.09, 100.42) 05/30/2021   17:09:42  ( -71.08, 100.36)    2.23                45
 05/30/2021   17:59:40   (  70.99, -92.10) 05/30/2021   17:59:08  (  70.97, -92.16)    2.55                32
 06/02/2021   09:25:15   ( -71.09,-143.64) 06/02/2021   09:26:11  ( -71.10,-143.72)    3.35                56
 06/02/2021   10:15:59   (  70.99,  23.84) 06/02/2021   10:15:38  (  70.99,  23.75)    3.10                21