Simultaneous Nadir Overpasses (SNOs) between FY3D and NOAA-19
TLE Epoch: 2021 4 8.  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, 161.28) 04/11/2021   23:35:35  (  78.40, 158.32)   66.17                67
 04/12/2021   00:27:31   ( -78.62, -32.68) 04/12/2021   00:26:31  ( -78.66, -32.68)    3.95                60
 04/12/2021   01:18:16   (  78.64, 134.52) 04/12/2021   01:17:27  (  78.66, 134.59)    2.44                49
 04/12/2021   02:09:01   ( -78.66, -58.29) 04/12/2021   02:08:32  ( -78.63, -58.33)    2.78                29
 04/12/2021   02:59:45   (  78.64, 109.14) 04/12/2021   02:59:27  (  78.67, 109.19)    3.45                18
 04/12/2021   03:50:30   ( -78.66, -83.67) 04/12/2021   03:50:32  ( -78.65, -83.73)    1.85                 2
 04/12/2021   04:41:15   (  78.68,  83.53) 04/12/2021   04:41:28  (  78.65,  83.54)    3.33                13
 04/12/2021   05:31:59   ( -78.66,-109.05) 04/12/2021   05:32:32  ( -78.66,-109.13)    1.85                33
 04/12/2021   06:22:44   (  78.68,  58.15) 04/12/2021   06:23:28  (  78.66,  58.14)    1.91                44
 04/12/2021   07:13:28   ( -78.66,-134.43) 04/12/2021   07:14:32  ( -78.67,-134.54)    2.78                64
 04/12/2021   08:04:13   (  78.68,  32.77) 04/12/2021   08:05:28  (  78.68,  32.74)    0.80                75