Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 5 16.  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)
 05/17/2021   06:56:39   (  71.07,  73.42) 05/17/2021   06:57:42  (  71.08,  73.34)    3.00                63
 05/17/2021   07:47:21   ( -71.03,-119.18) 05/17/2021   07:47:11  ( -71.02,-119.12)    2.29                10
 05/17/2021   08:37:56   (  70.45,  49.09) 05/17/2021   08:36:46  (  70.49,  47.71)   51.46                70
 05/19/2021   23:12:59   (  71.16,-170.79) 05/19/2021   23:14:11  (  71.12,-170.71)    5.23                72
 05/20/2021   00:03:39   ( -71.01,  -3.21) 05/20/2021   00:03:41  ( -71.01,  -3.26)    1.78                 2
 05/20/2021   00:54:22   (  70.85, 164.37) 05/20/2021   00:53:09  (  70.86, 164.15)    8.06                73
 05/22/2021   15:29:26   (  71.56, -55.56) 05/22/2021   15:30:36  (  71.43, -54.34)   45.58                70
 05/22/2021   16:19:59   ( -71.05, 112.67) 05/22/2021   16:20:11  ( -71.05, 112.68)    0.68                12
 05/22/2021   17:10:43   (  70.94, -79.84) 05/22/2021   17:09:38  (  70.95, -79.83)    0.95                65
 05/25/2021   07:45:53   (  71.96,  59.64) 05/25/2021   07:46:59  (  71.84,  62.23)   90.66                66
 05/25/2021   08:36:19   ( -71.08,-131.45) 05/25/2021   08:36:41  ( -71.09,-131.38)    2.68                22
 05/25/2021   09:27:03   (  70.98,  36.03) 05/25/2021   09:26:08  (  70.98,  36.10)    2.56                55
 05/28/2021   00:52:38   ( -71.07, -15.49) 05/28/2021   00:53:12  ( -71.06, -15.54)    1.77                34
 05/28/2021   01:43:22   (  70.97, 151.99) 05/28/2021   01:42:39  (  70.96, 151.94)    2.15                43
 05/30/2021   17:08:57   ( -71.11, 100.38) 05/30/2021   17:09:41  ( -71.09, 100.38)    1.88                44
 05/30/2021   17:59:41   (  71.01, -92.14) 05/30/2021   17:59:08  (  70.98, -92.14)    3.00                33