Simultaneous Nadir Overpasses (SNOs) between FY3D and NOAA-19
TLE Epoch: 2021 6 15.  Predictions up to the next  14.0 days:

     Date     Time(FY3D) FY3D Lat/Lon Date Time(NOAA-19) NOAA-19 Lat/Lon    Distance(km)  Time Diff(sec)
 06/19/2021   15:00:09   (  78.30, -68.56) 06/19/2021   14:58:59  (  78.31, -70.41)   41.85                70
 06/19/2021   15:50:57   ( -78.46,  97.83) 06/19/2021   15:49:53  ( -78.46,  97.81)    0.65                64
 06/19/2021   16:41:42   (  78.46, -94.84) 06/19/2021   16:40:55  (  78.47, -94.90)    1.52                47
 06/19/2021   17:32:26   ( -78.46,  72.45) 06/19/2021   17:31:53  ( -78.47,  72.39)    1.56                33
 06/19/2021   18:23:11   (  78.46,-120.22) 06/19/2021   18:22:55  (  78.48,-120.32)    2.84                16
 06/19/2021   19:13:55   ( -78.47,  47.07) 06/19/2021   19:13:53  ( -78.48,  46.97)    2.87                 2
 06/19/2021   20:04:41   (  78.50,-145.83) 06/19/2021   20:04:55  (  78.49,-145.74)    2.46                14
 06/19/2021   20:55:25   ( -78.51,  21.46) 06/19/2021   20:55:53  ( -78.50,  21.55)    2.41                28
 06/19/2021   21:46:10   (  78.51,-171.22) 06/19/2021   21:46:55  (  78.50,-171.17)    1.18                45
 06/19/2021   22:36:54   ( -78.51,  -3.92) 06/19/2021   22:37:53  ( -78.51,  -3.87)    1.22                59
 06/19/2021   23:27:41   (  78.58, 162.94) 06/19/2021   23:28:54  (  78.55, 163.65)   16.20                73