Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 11 18.  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)
 11/18/2021   10:09:31   (  71.45,  26.01) 11/18/2021   10:09:54  (  71.43,  25.99)    3.00                23
 11/18/2021   11:00:13   ( -71.35,-166.49) 11/18/2021   10:59:23  ( -71.36,-166.48)    1.24                50
 11/21/2021   00:46:14   (  71.68, 166.46) 11/21/2021   00:47:25  (  71.62, 166.92)   16.94                71
 11/21/2021   01:36:54   ( -71.45, -25.82) 11/21/2021   01:36:56  ( -71.45, -25.73)    3.18                 2
 11/21/2021   02:27:37   (  71.20, 141.93) 11/21/2021   02:26:25  (  71.25, 141.58)   13.32                72
 11/23/2021   16:13:50   ( -71.50, 114.89) 11/23/2021   16:14:29  ( -71.49, 114.93)    1.97                39
 11/23/2021   17:04:36   (  71.40, -77.64) 11/23/2021   17:03:56  (  71.38, -77.59)    2.20                40
 11/26/2021   06:51:04   ( -71.54,-104.48) 11/26/2021   06:52:03  ( -71.51,-104.42)    3.31                59
 11/26/2021   07:41:50   (  71.43,  63.01) 11/26/2021   07:41:30  (  71.41,  63.05)    3.31                20
 11/26/2021   08:32:19   ( -70.60,-128.26) 11/26/2021   08:31:12  ( -70.65,-130.51)   83.11                67
 11/28/2021   21:28:34   ( -71.52,  36.19) 11/28/2021   21:29:37  ( -71.53,  36.22)    1.72                63
 11/28/2021   22:19:20   (  71.41,-156.32) 11/28/2021   22:19:04  (  71.42,-156.31)    1.02                16
 11/28/2021   23:09:52   ( -70.72,  12.19) 11/28/2021   23:08:44  ( -70.78,  10.30)   69.51                68
 12/01/2021   12:06:21   ( -71.51, 176.78) 12/01/2021   12:07:12  ( -71.49, 176.77)    1.63                51
 12/01/2021   12:57:07   (  71.39, -15.72) 12/01/2021   12:56:39  (  71.38, -15.77)    2.58                28