Simultaneous Nadir Overpasses (SNOs) between FY3D and NOAA-19
TLE Epoch: 2021 4 9.  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)
 04/11/2021   23:36:42   (  78.41, 161.25) 04/11/2021   23:35:35  (  78.39, 158.31)   65.90                67
 04/12/2021   00:27:32   ( -78.62, -32.71) 04/12/2021   00:26:32  ( -78.65, -32.69)    3.24                60
 04/12/2021   01:18:17   (  78.64, 134.49) 04/12/2021   01:17:28  (  78.65, 134.58)    2.24                49
 04/12/2021   02:09:02   ( -78.66, -58.32) 04/12/2021   02:08:33  ( -78.63, -58.34)    3.44                29
 04/12/2021   02:59:45   (  78.64, 109.12) 04/12/2021   02:59:27  (  78.67, 109.18)    2.98                18
 04/12/2021   03:50:30   ( -78.66, -83.70) 04/12/2021   03:50:32  ( -78.65, -83.75)    2.29                 2
 04/12/2021   04:41:15   (  78.68,  83.50) 04/12/2021   04:41:28  (  78.65,  83.53)    3.99                13
 04/12/2021   05:31:59   ( -78.67,-109.08) 04/12/2021   05:32:32  ( -78.66,-109.15)    1.71                33
 04/12/2021   06:22:44   (  78.68,  58.12) 04/12/2021   06:23:28  (  78.66,  58.13)    2.54                44
 04/12/2021   07:13:28   ( -78.67,-134.46) 04/12/2021   07:14:32  ( -78.67,-134.55)    2.21                64
 04/12/2021   08:04:13   (  78.69,  32.75) 04/12/2021   08:05:28  (  78.67,  32.73)    1.18                75