Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 1 15.  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)
 01/16/2021   14:28:11   ( -71.60, 138.95) 01/16/2021   14:29:18  ( -71.51, 141.22)   80.42                67
 01/16/2021   15:18:41   (  70.76, -52.29) 01/16/2021   15:18:57  (  70.77, -52.33)    1.58                16
 01/16/2021   16:09:22   ( -70.66, 115.19) 01/16/2021   16:08:27  ( -70.65, 115.13)    2.57                55
 01/19/2021   07:35:03   (  70.82,  63.54) 01/19/2021   07:35:24  (  70.80,  63.60)    3.32                21
 01/19/2021   08:25:43   ( -70.67,-128.89) 01/19/2021   08:24:54  ( -70.68,-128.94)    2.10                49
 01/21/2021   23:51:23   (  70.83, 179.45) 01/21/2021   23:51:50  (  70.82, 179.52)    2.69                27
 01/22/2021   00:42:04   ( -70.73, -13.06) 01/22/2021   00:41:20  ( -70.71, -13.01)    2.86                44
 01/24/2021   16:07:44   (  70.84, -64.64) 01/24/2021   16:08:17  (  70.84, -64.56)    2.73                33
 01/24/2021   16:58:25   ( -70.74, 102.85) 01/24/2021   16:57:47  ( -70.73, 102.90)    2.09                38
 01/27/2021   08:24:05   (  70.85,  51.27) 01/27/2021   08:24:44  (  70.85,  51.34)    2.68                39
 01/27/2021   09:14:46   ( -70.75,-141.24) 01/27/2021   09:14:14  ( -70.74,-141.19)    1.83                32