Simultaneous Nadir Overpasses (SNOs) between FY3D and NOAA-19
TLE Epoch: 2021 4 5.  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   23:36:41   (  78.40, 161.33) 04/11/2021   23:35:34  (  78.40, 158.36)   66.25                67
 04/12/2021   00:27:32   ( -78.65, -32.85) 04/12/2021   00:26:32  ( -78.63, -32.86)    2.02                60
 04/12/2021   01:18:16   (  78.63, 134.57) 04/12/2021   01:17:27  (  78.66, 134.64)    3.81                49
 04/12/2021   02:09:01   ( -78.65, -58.23) 04/12/2021   02:08:32  ( -78.64, -58.26)    0.94                29
 04/12/2021   02:59:46   (  78.67, 108.96) 04/12/2021   02:59:28  (  78.64, 108.99)    3.16                18
 04/12/2021   03:50:30   ( -78.65, -83.61) 04/12/2021   03:50:32  ( -78.66, -83.67)    1.44                 2
 04/12/2021   04:41:15   (  78.67,  83.58) 04/12/2021   04:41:28  (  78.66,  83.59)    1.67                13
 04/12/2021   05:31:59   ( -78.65,-108.99) 04/12/2021   05:32:32  ( -78.67,-109.07)    2.76                33
 04/12/2021   06:22:44   (  78.67,  58.20) 04/12/2021   06:23:28  (  78.67,  58.19)    0.32                44
 04/12/2021   07:13:29   ( -78.69,-134.60) 04/12/2021   07:14:32  ( -78.68,-134.47)    2.85                63
 04/12/2021   08:04:13   (  78.67,  32.83) 04/12/2021   08:05:28  (  78.68,  32.79)    1.38                75