Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2021 7 19.  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)
 07/20/2021   16:00:35   ( -71.93, 116.42) 07/20/2021   16:01:42  ( -71.85, 118.67)   78.19                67
 07/20/2021   16:51:05   (  71.15, -74.85) 07/20/2021   16:51:20  (  71.16, -74.83)    1.74                15
 07/20/2021   17:41:47   ( -71.06,  92.62) 07/20/2021   17:40:50  ( -71.05,  92.63)    1.10                57
 07/23/2021   09:07:23   (  71.18,  41.05) 07/23/2021   09:07:49  (  71.20,  41.10)    3.10                26
 07/23/2021   09:58:05   ( -71.08,-151.47) 07/23/2021   09:57:19  ( -71.09,-151.44)    1.33                46
 07/26/2021   01:23:42   (  71.20, 156.94) 07/26/2021   01:24:20  (  71.17, 156.94)    3.34                38
 07/26/2021   02:14:24   ( -71.10, -35.56) 07/26/2021   02:13:49  ( -71.12, -35.51)    2.92                35
 07/28/2021   17:40:00   (  71.18, -87.07) 07/28/2021   17:40:50  (  71.20, -87.14)    3.29                50
 07/28/2021   18:30:43   ( -71.13,  80.34) 07/28/2021   18:30:20  ( -71.10,  80.33)    3.23                23
 07/31/2021   09:56:19   (  71.21,  28.82) 07/31/2021   09:57:20  (  71.22,  28.78)    2.28                61
 07/31/2021   10:47:02   ( -71.15,-163.76) 07/31/2021   10:46:50  ( -71.12,-163.75)    3.16                12