Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2019 10 21.  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)
 10/21/2019   15:00:02   (  70.41, -48.16) 10/21/2019   15:00:45  (  70.42, -48.21)    1.87                43
 10/21/2019   15:50:44   ( -70.33, 119.29) 10/21/2019   15:50:15  ( -70.30, 119.26)    3.02                29
 10/24/2019   07:16:28   (  70.41,  67.73) 10/24/2019   07:17:14  (  70.42,  67.68)    2.09                46
 10/24/2019   08:07:10   ( -70.32,-124.82) 10/24/2019   08:06:44  ( -70.31,-124.85)    1.68                26
 10/26/2019   23:32:54   (  70.42,-176.39) 10/26/2019   23:33:43  (  70.43,-176.43)    2.18                49
 10/27/2019   00:23:35   ( -70.32,  -8.92) 10/27/2019   00:23:12  ( -70.32,  -8.96)    1.44                23
 10/29/2019   15:49:19   (  70.42, -60.50) 10/29/2019   15:50:11  (  70.43, -60.55)    2.11                52
 10/29/2019   16:40:01   ( -70.32, 106.97) 10/29/2019   16:39:41  ( -70.32, 106.92)    1.83                20
 10/29/2019   17:30:29   (  69.41, -84.35) 10/29/2019   17:29:22  (  69.44, -86.66)   90.39                67
 11/01/2019   08:05:45   (  70.42,  55.38) 11/01/2019   08:06:40  (  70.42,  55.32)    2.30                55
 11/01/2019   08:56:27   ( -70.32,-137.14) 11/01/2019   08:56:10  ( -70.32,-137.20)    2.35                17
 11/01/2019   09:46:57   (  69.52,  31.38) 11/01/2019   09:45:49  (  69.55,  29.36)   78.56                68
 11/04/2019   00:22:11   (  70.43, 171.27) 11/04/2019   00:23:09  (  70.41, 171.19)    3.30                58
 11/04/2019   01:12:54   ( -70.37, -21.33) 11/04/2019   01:12:38  ( -70.37, -21.25)    3.17                16
 11/04/2019   02:03:24   (  69.58, 147.19) 11/04/2019   02:02:16  (  69.65, 145.38)   70.35                68