Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 1 10.  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)
 01/11/2021   05:55:21   ( -71.16, -92.14) 01/11/2021   05:56:32  ( -71.02, -91.34)   32.84                71
 01/11/2021   06:45:59   (  70.74,  75.89) 01/11/2021   06:46:02  (  70.76,  75.90)    2.18                 3
 01/11/2021   07:36:40   ( -70.64,-116.64) 01/11/2021   07:35:32  ( -70.64,-116.64)    0.34                68
 01/13/2021   22:11:46   ( -71.37,  23.42) 01/13/2021   22:12:55  ( -71.28,  24.95)   55.67                69
 01/13/2021   23:02:20   (  70.74,-168.20) 01/13/2021   23:02:30  (  70.74,-168.24)    1.65                10
 01/13/2021   23:53:01   ( -70.65,  -0.72) 01/13/2021   23:52:00  ( -70.63,  -0.78)    2.98                61
 01/16/2021   14:28:11   ( -71.59, 138.96) 01/16/2021   14:29:18  ( -71.53, 141.25)   80.74                67
 01/16/2021   15:18:41   (  70.75, -52.28) 01/16/2021   15:18:57  (  70.78, -52.30)    3.14                16
 01/16/2021   16:09:22   ( -70.65, 115.20) 01/16/2021   16:08:27  ( -70.67, 115.16)    2.10                55
 01/19/2021   07:35:01   (  70.76,  63.63) 01/19/2021   07:35:24  (  70.76,  63.55)    3.08                23
 01/19/2021   08:25:43   ( -70.72,-128.97) 01/19/2021   08:24:53  ( -70.70,-128.90)    3.05                50
 01/21/2021   23:51:22   (  70.78, 179.53) 01/21/2021   23:51:51  (  70.78, 179.47)    2.30                29
 01/22/2021   00:42:03   ( -70.68, -12.98) 01/22/2021   00:41:21  ( -70.68, -13.05)    2.79                42