Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 11 19.  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)
 11/21/2021   00:46:11   (  72.10, 165.70) 11/21/2021   00:47:19  (  72.02, 167.60)   65.35                68
 11/21/2021   01:36:42   ( -71.43, -25.73) 11/21/2021   01:36:58  ( -71.42, -25.79)    2.08                16
 11/21/2021   02:27:28   (  71.34, 141.73) 11/21/2021   02:26:25  (  71.33, 141.70)    1.75                63
 11/23/2021   16:13:25   ( -71.52, 114.95) 11/23/2021   16:14:33  ( -71.51, 114.95)    0.73                68
 11/23/2021   17:04:11   (  71.43, -77.58) 11/23/2021   17:04:00  (  71.41, -77.57)    1.74                11
 11/23/2021   17:54:46   ( -70.94,  90.58) 11/23/2021   17:53:35  ( -71.03,  89.46)   41.70                71
 11/26/2021   07:41:06   (  71.50,  63.08) 11/26/2021   07:41:35  (  71.49,  63.16)    3.19                29
 11/26/2021   08:31:48   ( -71.37,-129.36) 11/26/2021   08:31:05  ( -71.38,-129.38)    1.86                43
 11/28/2021   22:18:12   (  71.51,-156.20) 11/28/2021   22:19:11  (  71.51,-156.21)    0.85                59
 11/28/2021   23:08:55   ( -71.42,  11.29) 11/28/2021   23:08:41  ( -71.40,  11.25)    1.85                14
 11/28/2021   23:59:27   (  70.59, 180.00) 11/28/2021   23:58:20  (  70.64, 177.70)   84.96                67
 12/01/2021   12:55:33   (  71.72, -15.89) 12/01/2021   12:56:44  (  71.63, -15.41)   20.08                71
 12/01/2021   13:46:13   ( -71.46, 151.91) 12/01/2021   13:46:15  ( -71.47, 151.97)    2.90                 2
 12/01/2021   14:36:56   (  71.20, -40.34) 12/01/2021   14:35:44  (  71.25, -40.74)   15.53                72