Simultaneous Nadir Overpasses (SNOs) between FY3D and METOP-A
TLE Epoch: 2021 5 7.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(METOP-A) METOP-A Lat/Lon    Distance(km)  Time Diff(sec)
 05/20/2021   14:28:29   (  77.39, -56.29) 05/20/2021   14:29:36  (  77.35, -53.54)   66.94                67
 05/20/2021   15:19:10   ( -77.28, 111.53) 05/20/2021   15:20:20  ( -77.27, 113.42)   46.38                70
 05/20/2021   16:09:51   (  77.09, -80.35) 05/20/2021   16:11:04  (  77.07, -80.04)    8.11                73
 05/20/2021   17:00:33   ( -77.02,  87.26) 05/20/2021   17:01:47  ( -77.03,  87.11)    3.61                74
 05/20/2021   17:51:19   (  77.05,-105.55) 05/20/2021   17:52:26  (  77.05,-105.46)    2.25                67
 05/20/2021   18:42:02   ( -77.03,  61.88) 05/20/2021   18:43:08  ( -77.05,  61.87)    2.99                66
 05/20/2021   19:32:48   (  77.05,-130.93) 05/20/2021   19:33:48  (  77.03,-130.87)    2.68                60
 05/20/2021   20:23:31   ( -77.03,  36.50) 05/20/2021   20:24:30  ( -77.03,  36.46)    1.25                59
 05/20/2021   21:14:16   (  77.01,-156.12) 05/20/2021   21:15:10  (  77.01,-156.29)    4.15                54
 05/20/2021   22:05:00   ( -77.03,  11.12) 05/20/2021   22:05:52  ( -77.02,  11.04)    2.55                52
 05/20/2021   22:55:45   (  77.01, 178.50) 05/20/2021   22:56:31  (  77.04, 178.47)    2.89                46
 05/20/2021   23:46:29   ( -77.03, -14.26) 05/20/2021   23:47:13  ( -77.04, -14.20)    1.80                44
 05/21/2021   00:37:14   (  77.02, 153.12) 05/21/2021   00:37:53  (  77.02, 153.05)    1.68                39
 05/21/2021   01:27:58   ( -77.03, -39.64) 05/21/2021   01:28:35  ( -77.02, -39.61)    1.42                37
 05/21/2021   02:18:43   (  77.02, 127.74) 05/21/2021   02:19:15  (  77.00, 127.64)    3.14                32
 05/21/2021   03:09:27   ( -77.04, -65.02) 05/21/2021   03:09:57  ( -77.00, -65.03)    3.63                30
 05/21/2021   04:00:12   (  77.02, 102.36) 05/21/2021   04:00:36  (  77.03, 102.40)    1.22                24
 05/21/2021   04:50:56   ( -77.04, -90.39) 05/21/2021   04:51:18  ( -77.03, -90.27)    3.26                22