Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 2 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)
 02/20/2021   11:41:52   ( -70.87,-178.08) 02/20/2021   11:42:31  ( -70.88,-178.10)    1.72                39
 02/20/2021   12:32:36   (  70.77, -10.61) 02/20/2021   12:31:58  (  70.79, -10.60)    2.04                38
 02/23/2021   03:58:12   ( -70.89, -62.19) 02/23/2021   03:58:58  ( -70.89, -62.21)    1.00                46
 02/23/2021   04:48:56   (  70.80, 105.27) 02/23/2021   04:48:25  (  70.79, 105.28)    1.02                31
 02/25/2021   20:14:33   ( -70.92,  53.70) 02/25/2021   20:15:26  ( -70.89,  53.67)    3.03                53
 02/25/2021   21:05:16   (  70.78,-138.76) 02/25/2021   21:04:53  (  70.79,-138.84)    3.05                23
 02/25/2021   21:55:43   ( -69.93,  29.92) 02/25/2021   21:54:36  ( -69.97,  27.59)   88.99                67
 02/28/2021   12:30:54   ( -70.95, 169.58) 02/28/2021   12:31:53  ( -70.95, 169.63)    1.71                59
 02/28/2021   13:21:37   (  70.82, -22.89) 02/28/2021   13:21:20  (  70.84, -22.88)    2.85                17
 02/28/2021   14:12:08   ( -70.16, 145.48) 02/28/2021   14:10:59  ( -70.24, 143.85)   61.93                69
 03/03/2021   04:47:14   ( -70.92, -74.45) 03/03/2021   04:48:21  ( -70.94, -74.50)    2.61                67
 03/03/2021   05:37:58   (  70.85,  92.98) 03/03/2021   05:37:48  (  70.83,  92.98)    2.21                10
 03/03/2021   06:28:34   ( -70.46, -99.05) 03/03/2021   06:27:22  ( -70.51, -99.87)   31.29                72
 03/05/2021   21:03:35   ( -71.01,  41.34) 03/05/2021   21:04:47  ( -70.98,  41.45)    4.72                72
 03/05/2021   21:54:18   (  70.89,-151.15) 03/05/2021   21:54:14  (  70.88,-151.07)    3.44                 4
 03/05/2021   22:44:58   ( -70.70,  16.49) 03/05/2021   22:43:45  ( -70.72,  16.32)    6.79                73