Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 3 6.  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)
 03/08/2021   13:20:00   ( -71.25, 156.86) 03/08/2021   13:21:11  ( -71.16, 157.60)   28.65                71
 03/08/2021   14:10:38   (  70.87, -35.18) 03/08/2021   14:10:41  (  70.90, -35.16)    3.03                 3
 03/08/2021   15:01:20   ( -70.79, 132.28) 03/08/2021   15:00:11  ( -70.78, 132.29)    0.82                69
 03/11/2021   05:36:25   ( -71.49, -87.64) 03/11/2021   05:37:34  ( -71.40, -86.12)   54.39                69
 03/11/2021   06:26:59   (  70.91,  80.69) 03/11/2021   06:27:08  (  70.92,  80.76)    3.02                 9
 03/11/2021   07:17:41   ( -70.82,-111.84) 03/11/2021   07:16:38  ( -70.81,-111.78)    2.39                63
 03/13/2021   21:52:50   ( -71.73,  27.86) 03/13/2021   21:53:57  ( -71.64,  30.16)   80.83                67
 03/13/2021   22:43:19   (  70.90,-163.36) 03/13/2021   22:43:36  (  70.89,-163.41)    1.97                17
 03/13/2021   23:34:01   ( -70.80,   4.12) 03/13/2021   23:33:06  ( -70.78,   4.05)    3.28                55
 03/16/2021   14:59:39   (  70.94, -47.50) 03/16/2021   15:00:02  (  70.91, -47.50)    3.39                23
 03/16/2021   15:50:21   ( -70.84, 119.99) 03/16/2021   15:49:31  ( -70.85, 120.05)    3.03                50
 03/19/2021   07:15:59   (  70.93,  68.45) 03/19/2021   07:16:29  (  70.92,  68.40)    2.00                30
 03/19/2021   08:06:41   ( -70.82,-124.05) 03/19/2021   08:05:59  ( -70.82,-124.13)    2.72                42