Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 1 13.  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)
 01/13/2021   22:11:46   ( -71.37,  23.42) 01/13/2021   22:12:55  ( -71.28,  24.95)   55.26                69
 01/13/2021   23:02:20   (  70.74,-168.19) 01/13/2021   23:02:30  (  70.74,-168.24)    2.06                10
 01/13/2021   23:53:01   ( -70.64,  -0.71) 01/13/2021   23:52:00  ( -70.63,  -0.78)    3.32                61
 01/16/2021   14:28:11   ( -71.58, 138.98) 01/16/2021   14:29:19  ( -71.47, 141.15)   77.64                68
 01/16/2021   15:18:42   (  70.79, -52.35) 01/16/2021   15:18:57  (  70.78, -52.30)    2.48                15
 01/16/2021   16:09:22   ( -70.65, 115.21) 01/16/2021   16:08:27  ( -70.66, 115.16)    2.91                55
 01/19/2021   07:35:02   (  70.80,  63.57) 01/19/2021   07:35:23  (  70.81,  63.63)    2.42                21
 01/19/2021   08:25:43   ( -70.70,-128.95) 01/19/2021   08:24:53  ( -70.70,-128.91)    1.62                50
 01/21/2021   23:51:23   (  70.81, 179.48) 01/21/2021   23:51:51  (  70.78, 179.47)    3.16                28
 01/22/2021   00:42:04   ( -70.71, -13.03) 01/22/2021   00:41:20  ( -70.73, -12.98)    2.60                44
 01/24/2021   16:07:44   (  70.82, -64.61) 01/24/2021   16:08:18  (  70.80, -64.62)    1.92                34
 01/24/2021   16:58:25   ( -70.72, 102.88) 01/24/2021   16:57:48  ( -70.69, 102.85)    2.69                37