Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 4 5.  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)
 04/07/2021   01:10:29   (  71.54, 158.92) 04/07/2021   01:11:38  (  71.45, 160.36)   51.64                69
 04/07/2021   02:01:02   ( -70.98, -32.77) 04/07/2021   02:01:15  ( -70.96, -32.79)    2.04                13
 04/07/2021   02:51:45   (  70.86, 134.73) 04/07/2021   02:50:42  (  70.86, 134.70)    1.33                63
 04/09/2021   17:26:53   (  71.80, -85.63) 04/09/2021   17:28:00  (  71.73, -83.30)   81.39                67
 04/09/2021   18:17:21   ( -70.98,  83.15) 04/09/2021   18:17:42  ( -70.97,  83.10)    2.51                21
 04/09/2021   19:08:04   (  70.87,-109.35) 04/09/2021   19:07:09  (  70.86,-109.42)    2.69                55
 04/12/2021   10:33:42   ( -71.04,-161.02) 04/12/2021   10:34:09  ( -71.03,-160.93)    3.67                27
 04/12/2021   11:24:25   (  70.93,   6.48) 04/12/2021   11:23:36  (  70.92,   6.54)    2.84                49
 04/15/2021   02:50:01   ( -71.00, -45.01) 04/15/2021   02:50:37  ( -71.03, -45.06)    3.01                36
 04/15/2021   03:40:45   (  70.94, 122.40) 04/15/2021   03:40:04  (  70.91, 122.42)    3.37                41
 04/17/2021   19:06:21   ( -71.02,  70.90) 04/17/2021   19:07:05  ( -71.02,  70.82)    3.13                44
 04/17/2021   19:57:05   (  70.96,-121.69) 04/17/2021   19:56:31  (  70.96,-121.63)    2.08                34