Simultaneous Nadir Overpasses (SNOs) between FY3D and LANDSAT-8
TLE Epoch: 2020 5 12.  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)
 05/12/2020   06:19:28   ( -70.66, -98.21) 05/12/2020   06:20:34  ( -70.66, -98.14)    2.54                66
 05/12/2020   07:10:12   (  70.54,  69.29) 05/12/2020   07:10:01  (  70.55,  69.34)    1.76                11
 05/12/2020   08:00:47   ( -70.13,-122.74) 05/12/2020   07:59:35  ( -70.23,-123.50)   30.44                72
 05/14/2020   22:35:52   ( -70.67,  17.68) 05/14/2020   22:37:04  ( -70.66,  17.73)    2.21                72
 05/14/2020   23:26:36   (  70.56,-174.82) 05/14/2020   23:26:31  (  70.54,-174.80)    1.50                 5
 05/15/2020   00:17:15   ( -70.35,  -7.18) 05/15/2020   00:16:02  ( -70.39,  -7.39)    8.96                73
 05/17/2020   14:52:19   ( -70.89, 133.23) 05/17/2020   14:53:31  ( -70.80, 133.82)   23.69                72
 05/17/2020   15:42:59   (  70.57, -58.93) 05/17/2020   15:43:00  (  70.58, -58.88)    2.36                 1
 05/17/2020   16:33:40   ( -70.47, 108.55) 05/17/2020   16:32:30  ( -70.48, 108.62)    3.02                70
 05/20/2020   07:08:48   ( -71.17,-111.33) 05/20/2020   07:09:58  ( -71.04,-109.95)   51.54                70
 05/20/2020   07:59:23   (  70.59,  56.95) 05/20/2020   07:59:31  (  70.60,  57.02)    2.92                 8
 05/20/2020   08:50:04   ( -70.48,-135.57) 05/20/2020   08:49:02  ( -70.45,-135.57)    3.66                62
 05/22/2020   23:25:17   ( -71.44,   4.10) 05/22/2020   23:26:24  ( -71.37,   6.44)   83.19                67
 05/23/2020   00:15:47   (  70.60, 172.83) 05/23/2020   00:16:03  (  70.60, 172.89)    2.12                16
 05/23/2020   01:06:28   ( -70.50, -19.68) 05/23/2020   01:05:33  ( -70.51, -19.62)    2.75                55
 05/25/2020   16:32:10   (  70.57, -71.21) 05/25/2020   16:32:36  (  70.59, -71.27)    3.31                26
 05/25/2020   17:22:51   ( -70.51,  96.20) 05/25/2020   17:22:05  ( -70.50,  96.23)    1.75                46