Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 3 11.  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)
 03/11/2021   05:36:25   ( -71.49, -87.63) 03/11/2021   05:37:34  ( -71.41, -86.11)   54.38                69
 03/11/2021   06:26:59   (  70.90,  80.70) 03/11/2021   06:27:09  (  70.89,  80.70)    1.62                10
 03/11/2021   07:17:41   ( -70.81,-111.84) 03/11/2021   07:16:38  ( -70.82,-111.77)    2.46                63
 03/13/2021   21:52:49   ( -71.73,  27.86) 03/13/2021   21:53:56  ( -71.65,  30.17)   81.01                67
 03/13/2021   22:43:18   (  70.89,-163.35) 03/13/2021   22:43:35  (  70.91,-163.39)    2.33                17
 03/13/2021   23:34:00   ( -70.80,   4.12) 03/13/2021   23:33:05  ( -70.79,   4.07)    2.30                55
 03/16/2021   14:59:39   (  70.93, -47.49) 03/16/2021   15:00:02  (  70.92, -47.48)    1.34                23
 03/16/2021   15:50:21   ( -70.84, 119.99) 03/16/2021   15:49:32  ( -70.81, 119.98)    3.11                49
 03/19/2021   07:15:59   (  70.93,  68.45) 03/19/2021   07:16:29  (  70.93,  68.42)    1.51                30
 03/19/2021   08:06:41   ( -70.83,-124.06) 03/19/2021   08:05:59  ( -70.82,-124.12)    2.22                42
 03/21/2021   23:32:19   (  70.92,-175.60) 03/21/2021   23:32:56  (  70.94,-175.69)    3.70                37
 03/22/2021   00:23:02   ( -70.87,  -8.20) 03/22/2021   00:22:25  ( -70.89,  -8.14)    3.09                37
 03/24/2021   15:48:39   (  70.97, -59.75) 03/24/2021   15:49:21  (  71.00, -59.72)    3.00                42
 03/24/2021   16:39:21   ( -70.86, 107.75) 03/24/2021   16:38:51  ( -70.89, 107.75)    3.57                30