Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 12 4.  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)
 12/04/2021   06:01:47   ( -71.52, -92.07) 12/04/2021   06:02:43  ( -71.52, -92.08)    0.71                56
 12/04/2021   06:52:32   (  71.40,  75.44) 12/04/2021   06:52:10  (  71.43,  75.41)    3.09                22
 12/04/2021   07:43:00   ( -70.56,-115.81) 12/04/2021   07:41:53  ( -70.61,-118.24)   90.11                67
 12/06/2021   21:28:59   (  71.52,-143.86) 12/06/2021   21:29:44  (  71.53,-143.82)    1.81                45
 12/06/2021   22:19:41   ( -71.39,  23.68) 12/06/2021   22:19:14  ( -71.42,  23.63)    3.32                27
 12/09/2021   12:56:08   ( -71.51, 164.40) 12/09/2021   12:56:48  ( -71.52, 164.39)    1.18                40
 12/09/2021   13:46:53   (  71.40, -28.12) 12/09/2021   13:46:15  (  71.41, -28.13)    1.07                38
 12/12/2021   04:23:19   (  71.53, 112.58) 12/12/2021   04:23:48  (  71.50, 112.61)    3.25                29
 12/12/2021   05:14:01   ( -71.39, -79.86) 12/12/2021   05:13:18  ( -71.39, -79.93)    2.69                43
 12/14/2021   19:50:28   ( -71.50,  60.85) 12/14/2021   19:50:51  ( -71.53,  60.90)    3.31                23
 12/14/2021   20:41:13   (  71.42,-131.70) 12/14/2021   20:40:18  (  71.42,-131.64)    2.10                55
 12/17/2021   10:27:07   ( -72.24,-159.62) 12/17/2021   10:28:15  ( -72.14,-157.45)   74.63                68
 12/17/2021   11:17:39   (  71.50,   9.08) 12/17/2021   11:17:52  (  71.50,   9.09)    0.30                13
 12/17/2021   12:08:22   ( -71.39, 176.58) 12/17/2021   12:07:22  ( -71.39, 176.55)    0.99                60