Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 10 27.  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)
 10/27/2021   23:07:45   ( -71.44,  11.24) 10/27/2021   23:08:44  ( -71.42,  11.27)    2.72                59
 10/27/2021   23:58:29   (  71.35, 178.71) 10/27/2021   23:58:11  (  71.33, 178.77)    3.17                18
 10/28/2021   00:48:59   ( -70.67, -12.80) 10/28/2021   00:47:50  ( -70.72, -14.56)   64.74                69
 10/30/2021   15:24:02   ( -71.43, 127.22) 10/30/2021   15:25:13  ( -71.41, 127.15)    2.99                71
 10/30/2021   16:14:46   (  71.35, -65.32) 10/30/2021   16:14:40  (  71.32, -65.36)    3.23                 6
 10/30/2021   17:05:24   ( -71.07, 102.47) 10/30/2021   17:04:11  ( -71.15, 101.99)   19.11                73
 11/02/2021   07:40:26   ( -71.78,-117.47) 11/02/2021   07:41:37  ( -71.67,-116.54)   34.55                71
 11/02/2021   08:31:03   (  71.34,  50.63) 11/02/2021   08:31:08  (  71.36,  50.58)    2.51                 5
 11/02/2021   09:21:45   ( -71.27,-141.92) 11/02/2021   09:20:38  ( -71.25,-141.97)    3.25                67
 11/04/2021   23:56:51   ( -72.18,  -2.29) 11/04/2021   23:57:58  ( -72.08,   0.05)   80.51                67
 11/05/2021   00:47:21   (  71.40, 166.49) 11/05/2021   00:47:36  (  71.39, 166.52)    0.93                15
 11/05/2021   01:38:02   ( -71.26, -25.96) 11/05/2021   01:37:06  ( -71.28, -26.03)    3.26                56
 11/07/2021   17:03:37   (  71.40, -77.56) 11/07/2021   17:04:03  (  71.42, -77.56)    2.34                26
 11/07/2021   17:54:19   ( -71.31,  89.91) 11/07/2021   17:53:33  ( -71.31,  89.90)    0.38                46