Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 4 3.  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)
 04/04/2021   08:54:03   (  71.24,  43.53) 04/04/2021   08:55:15  (  71.15,  44.00)   19.45                72
 04/04/2021   09:44:41   ( -70.93,-148.63) 04/04/2021   09:44:47  ( -70.93,-148.71)    2.88                 6
 04/04/2021   10:35:24   (  70.82,  18.86) 04/04/2021   10:34:14  (  70.83,  18.78)    3.32                70
 04/07/2021   01:10:29   (  71.55, 158.90) 04/07/2021   01:11:38  (  71.43, 160.33)   52.31                69
 04/07/2021   02:01:02   ( -70.99, -32.79) 04/07/2021   02:01:14  ( -71.00, -32.73)    2.51                12
 04/07/2021   02:51:45   (  70.88, 134.70) 04/07/2021   02:50:41  (  70.89, 134.75)    2.48                64
 04/09/2021   17:26:54   (  71.82, -85.65) 04/09/2021   17:28:01  (  71.71, -83.33)   81.63                67
 04/09/2021   18:17:22   ( -70.99,  83.13) 04/09/2021   18:17:42  ( -71.01,  83.16)    1.76                20
 04/09/2021   19:08:05   (  70.88,-109.37) 04/09/2021   19:07:09  (  70.90,-109.36)    1.56                56
 04/12/2021   10:33:41   ( -71.00,-160.94) 04/12/2021   10:34:09  ( -71.01,-160.96)    1.19                28
 04/12/2021   11:24:24   (  70.89,   6.55) 04/12/2021   11:23:36  (  70.90,   6.52)    1.41                48
 04/15/2021   02:50:01   ( -71.01, -45.03) 04/15/2021   02:50:37  ( -71.01, -45.08)    2.04                36
 04/15/2021   03:40:44   (  70.90, 122.47) 04/15/2021   03:40:04  (  70.89, 122.39)    3.05                40