Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 1 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)
 01/19/2021   07:35:02   (  70.79,  63.57) 01/19/2021   07:35:24  (  70.78,  63.58)    1.39                22
 01/19/2021   08:25:43   ( -70.70,-128.95) 01/19/2021   08:24:53  ( -70.72,-128.88)    3.16                50
 01/21/2021   23:51:23   (  70.80, 179.49) 01/21/2021   23:51:53  (  70.79, 179.46)    1.96                30
 01/22/2021   00:42:04   ( -70.71, -13.03) 01/22/2021   00:41:22  ( -70.73, -12.99)    2.53                42
 01/24/2021   16:07:44   (  70.81, -64.59) 01/24/2021   16:08:21  (  70.84, -64.58)    3.54                37
 01/24/2021   16:58:25   ( -70.71, 102.89) 01/24/2021   16:57:51  ( -70.73, 102.89)    1.80                34
 01/27/2021   08:24:05   (  70.82,  51.32) 01/27/2021   08:24:50  (  70.84,  51.30)    2.08                45
 01/27/2021   09:14:46   ( -70.72,-141.20) 01/27/2021   09:14:20  ( -70.73,-141.24)    1.77                26
 01/30/2021   00:40:25   (  70.83, 167.23) 01/30/2021   00:41:18  (  70.83, 167.16)    2.51                53
 01/30/2021   01:31:07   ( -70.78, -25.37) 01/30/2021   01:30:47  ( -70.78, -25.29)    2.98                20
 01/30/2021   02:21:35   (  69.83, 143.44) 01/30/2021   02:20:29  (  69.84, 141.00)   93.33                66
 02/01/2021   16:56:46   (  70.84, -76.87) 02/01/2021   16:57:46  (  70.87, -76.90)    3.05                60
 02/01/2021   17:47:28   ( -70.79,  90.55) 02/01/2021   17:47:16  ( -70.76,  90.58)    2.93                12
 02/01/2021   18:38:01   (  70.11,-101.06) 02/01/2021   18:36:52  (  70.16,-102.67)   61.31                69