Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 2 12.  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)
 02/12/2021   10:02:21   (  71.54,  25.64) 02/12/2021   10:03:29  (  71.44,  27.51)   67.07                68
 02/12/2021   10:52:50   ( -70.82,-165.78) 02/12/2021   10:53:08  ( -70.83,-165.83)    1.93                18
 02/12/2021   11:43:34   (  70.71,   1.70) 02/12/2021   11:42:35  (  70.73,   1.68)    2.78                59
 02/15/2021   02:18:47   (  71.83, 141.05) 02/15/2021   02:19:52  (  71.73, 143.87)   98.57                65
 02/15/2021   03:09:11   ( -70.84, -49.88) 02/15/2021   03:09:36  ( -70.85, -49.91)    1.83                25
 02/15/2021   03:59:55   (  70.74, 117.59) 02/15/2021   03:59:03  (  70.75, 117.58)    1.83                52
 02/17/2021   19:25:31   ( -70.85,  66.02) 02/17/2021   19:26:03  ( -70.86,  65.99)    1.43                32
 02/17/2021   20:16:15   (  70.76,-126.52) 02/17/2021   20:15:30  (  70.76,-126.52)    0.28                45
 02/20/2021   11:41:52   ( -70.88,-178.09) 02/20/2021   11:42:31  ( -70.87,-178.11)    1.01                39
 02/20/2021   12:32:36   (  70.79, -10.63) 02/20/2021   12:31:58  (  70.77, -10.63)    1.90                38
 02/23/2021   03:58:13   ( -70.90, -62.19) 02/23/2021   03:58:59  ( -70.88, -62.23)    2.13                46
 02/23/2021   04:48:56   (  70.76, 105.34) 02/23/2021   04:48:26  (  70.77, 105.26)    3.16                30
 02/25/2021   20:14:34   ( -70.92,  53.70) 02/25/2021   20:15:26  ( -70.94,  53.74)    2.44                52
 02/25/2021   21:05:17   (  70.79,-138.78) 02/25/2021   21:04:53  (  70.83,-138.78)    3.75                24