Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 4 4.  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   08:54:04   (  71.28,  43.45) 04/04/2021   08:55:15  (  71.16,  44.02)   24.09                71
 04/04/2021   09:44:41   ( -70.92,-148.62) 04/04/2021   09:44:47  ( -70.94,-148.70)    3.27                 6
 04/04/2021   10:35:25   (  70.86,  18.79) 04/04/2021   10:34:14  (  70.84,  18.79)    2.58                71
 04/07/2021   01:10:29   (  71.54, 158.91) 04/07/2021   01:11:38  (  71.44, 160.35)   51.97                69
 04/07/2021   02:01:02   ( -70.98, -32.78) 04/07/2021   02:01:15  ( -70.95, -32.80)    3.25                13
 04/07/2021   02:51:45   (  70.87, 134.72) 04/07/2021   02:50:42  (  70.85, 134.68)    2.59                63
 04/09/2021   17:26:54   (  71.81, -85.64) 04/09/2021   17:28:01  (  71.72, -83.31)   81.62                67
 04/09/2021   18:17:22   ( -70.99,  83.14) 04/09/2021   18:17:42  ( -71.01,  83.17)    3.17                20
 04/09/2021   19:08:05   (  70.88,-109.36) 04/09/2021   19:07:09  (  70.91,-109.35)    3.34                56
 04/12/2021   10:33:41   ( -71.00,-160.94) 04/12/2021   10:34:09  ( -71.02,-160.94)    2.23                28
 04/12/2021   11:24:24   (  70.89,   6.56) 04/12/2021   11:23:36  (  70.91,   6.53)    2.32                48
 04/15/2021   02:50:01   ( -71.01, -45.03) 04/15/2021   02:50:37  ( -71.02, -45.07)    1.70                36
 04/15/2021   03:40:44   (  70.90, 122.47) 04/15/2021   03:40:04  (  70.90, 122.40)    2.51                40
 04/17/2021   19:06:21   ( -71.02,  70.88) 04/17/2021   19:07:05  ( -71.01,  70.80)    3.43                44
 04/17/2021   19:57:05   (  70.97,-121.71) 04/17/2021   19:56:31  (  70.95,-121.65)    2.84                34