Simultaneous Nadir Overpasses (SNOs) between FY3D and NOAA-19
TLE Epoch: 2021 4 10.  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   (  78.43, 161.14) 04/11/2021   23:35:34  (  78.41, 158.42)   60.78                68
 04/12/2021   00:27:32   ( -78.64, -32.83) 04/12/2021   00:26:32  ( -78.64, -32.82)    1.01                60
 04/12/2021   01:18:17   (  78.66, 134.38) 04/12/2021   01:17:28  (  78.64, 134.45)    3.23                49
 04/12/2021   02:09:01   ( -78.65, -58.21) 04/12/2021   02:08:32  ( -78.65, -58.23)    0.54                29
 04/12/2021   02:59:46   (  78.66, 109.00) 04/12/2021   02:59:28  (  78.65, 109.05)    1.78                18
 04/12/2021   03:50:30   ( -78.65, -83.59) 04/12/2021   03:50:32  ( -78.66, -83.63)    1.97                 2
 04/12/2021   04:41:15   (  78.66,  83.62) 04/12/2021   04:41:28  (  78.66,  83.65)    0.63                13
 04/12/2021   05:31:59   ( -78.65,-108.97) 04/12/2021   05:32:32  ( -78.68,-109.03)    3.43                33
 04/12/2021   06:22:44   (  78.66,  58.24) 04/12/2021   06:23:28  (  78.68,  58.25)    1.44                44
 04/12/2021   07:13:29   ( -78.69,-134.58) 04/12/2021   07:14:32  ( -78.69,-134.44)    3.06                63
 04/12/2021   08:04:13   (  78.67,  32.87) 04/12/2021   08:05:28  (  78.69,  32.85)    2.85                75