Simultaneous Nadir Overpasses (SNOs) between FY3D and NOAA-19
TLE Epoch: 2021 4 6.  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   (  78.42, 161.22) 04/11/2021   23:35:34  (  78.42, 158.46)   61.44                68
 04/12/2021   00:27:32   ( -78.63, -32.74) 04/12/2021   00:26:32  ( -78.64, -32.76)    1.63                60
 04/12/2021   01:18:17   (  78.65, 134.45) 04/12/2021   01:17:28  (  78.64, 134.50)    1.18                49
 04/12/2021   02:09:01   ( -78.63, -58.12) 04/12/2021   02:08:32  ( -78.66, -58.17)    3.12                29
 04/12/2021   02:59:46   (  78.65, 109.08) 04/12/2021   02:59:28  (  78.66, 109.10)    0.81                18
 04/12/2021   03:50:31   ( -78.67, -83.73) 04/12/2021   03:50:32  ( -78.67, -83.57)    3.52                 1
 04/12/2021   04:41:15   (  78.65,  83.70) 04/12/2021   04:41:28  (  78.67,  83.70)    2.11                13
 04/12/2021   05:32:00   ( -78.67,-109.11) 04/12/2021   05:32:33  ( -78.65,-109.22)    3.32                33
 04/12/2021   06:22:44   (  78.65,  58.32) 04/12/2021   06:23:28  (  78.68,  58.30)    3.57                44
 04/12/2021   07:13:29   ( -78.67,-134.48) 04/12/2021   07:14:33  ( -78.66,-134.62)    3.10                64
 04/12/2021   08:04:14   (  78.69,  32.71) 04/12/2021   08:05:29  (  78.66,  32.65)    3.29                75