Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 4 7.  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)
 04/09/2021   17:26:54   (  71.81, -85.64) 04/09/2021   17:28:01  (  71.72, -83.31)   81.55                67
 04/09/2021   18:17:22   ( -70.99,  83.14) 04/09/2021   18:17:42  ( -71.01,  83.17)    2.76                20
 04/09/2021   19:08:05   (  70.88,-109.36) 04/09/2021   19:07:10  (  70.86,-109.43)    3.44                55
 04/12/2021   10:33:41   ( -71.00,-160.94) 04/12/2021   10:34:09  ( -71.02,-160.95)    2.08                28
 04/12/2021   11:24:24   (  70.89,   6.56) 04/12/2021   11:23:36  (  70.91,   6.53)    2.95                48
 04/15/2021   02:50:01   ( -71.01, -45.02) 04/15/2021   02:50:37  ( -71.02, -45.07)    1.88                36
 04/15/2021   03:40:44   (  70.90, 122.48) 04/15/2021   03:40:04  (  70.91, 122.41)    2.89                40
 04/17/2021   19:06:22   ( -71.07,  70.80) 04/17/2021   19:07:04  ( -71.07,  70.89)    3.13                42
 04/17/2021   19:57:05   (  70.96,-121.70) 04/17/2021   19:56:31  (  70.95,-121.64)    2.01                34
 04/20/2021   11:22:41   ( -71.04,-173.20) 04/20/2021   11:23:32  ( -71.06,-173.25)    3.06                51
 04/20/2021   12:13:25   (  70.97,  -5.78) 04/20/2021   12:12:59  (  70.94,  -5.78)    3.55                26