Simultaneous Nadir Overpasses (SNOs) between FY3D and METOP-A
TLE Epoch: 2021 12 1.  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)
 12/02/2021   08:22:48   ( -77.70,-144.81) 12/02/2021   08:22:27  ( -77.67,-144.85)    3.27                21
 12/04/2021   11:08:32   ( -77.68, 173.84) 12/04/2021   11:08:19  ( -77.67, 173.77)    2.74                13
 12/06/2021   13:54:16   ( -77.67, 132.49) 12/06/2021   13:54:11  ( -77.66, 132.36)    3.51                 5
 12/06/2021   14:45:02   (  77.65, -60.13) 12/06/2021   14:43:51  (  77.66, -60.04)    2.20                71
 12/08/2021   16:40:00   ( -77.66,  91.12) 12/08/2021   16:40:02  ( -77.69,  91.14)    3.37                 2
 12/08/2021   17:30:46   (  77.65,-101.51) 12/08/2021   17:29:50  (  77.66,-101.42)    2.72                56
 12/10/2021   19:25:44   ( -77.65,  49.76) 12/10/2021   19:25:54  ( -77.68,  49.72)    3.20                10
 12/10/2021   20:16:30   (  77.64,-142.91) 12/10/2021   20:15:49  (  77.64,-142.90)    0.14                41
 12/12/2021   22:11:28   ( -77.64,   8.38) 12/12/2021   22:11:46  ( -77.66,   8.30)    3.34                18
 12/12/2021   23:02:14   (  77.64, 175.69) 12/12/2021   23:01:47  (  77.64, 175.69)    0.05                27
 12/15/2021   00:57:13   ( -77.67, -33.20) 12/15/2021   00:57:38  ( -77.66, -33.10)    3.15                25