Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 12 22.  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)
 12/23/2020   12:00:48   ( -70.74, 177.09) 12/23/2020   12:01:23  ( -70.72, 177.03)    3.03                35
 12/23/2020   12:51:32   (  70.65, -15.46) 12/23/2020   12:50:49  (  70.67, -15.40)    3.26                43
 12/26/2020   04:17:09   ( -70.78, -67.05) 12/26/2020   04:17:50  ( -70.75, -67.05)    3.56                41
 12/26/2020   05:07:52   (  70.64, 100.49) 12/26/2020   05:07:17  (  70.64, 100.43)    2.16                35
 12/28/2020   20:33:30   ( -70.76,  48.90) 12/28/2020   20:34:18  ( -70.77,  48.86)    1.35                48
 12/28/2020   21:24:14   (  70.68,-143.65) 12/28/2020   21:23:45  (  70.66,-143.66)    2.04                29
 12/31/2020   12:49:52   ( -70.81, 164.76) 12/31/2020   12:50:46  ( -70.78, 164.76)    2.78                54
 12/31/2020   13:40:35   (  70.66, -27.70) 12/31/2020   13:40:13  (  70.67, -27.76)    2.32                22
 12/31/2020   14:31:03   ( -69.86, 140.88) 12/31/2020   14:29:55  ( -69.91, 138.77)   80.77                68
 01/03/2021   05:06:13   ( -70.79, -79.30) 01/03/2021   05:07:14  ( -70.79, -79.34)    1.53                61
 01/03/2021   05:56:57   (  70.70,  88.16) 01/03/2021   05:56:41  (  70.68,  88.13)    3.14                16