Simultaneous Nadir Overpasses (SNOs) between FY3D and NOAA-19
TLE Epoch: 2021 4 4.  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, 161.13) 04/11/2021   23:35:34  (  78.41, 158.41)   60.87                68
 04/12/2021   00:27:32   ( -78.64, -32.81) 04/12/2021   00:26:32  ( -78.64, -32.81)    0.50                60
 04/12/2021   01:18:17   (  78.66, 134.37) 04/12/2021   01:17:28  (  78.63, 134.44)    3.52                49
 04/12/2021   02:09:01   ( -78.64, -58.19) 04/12/2021   02:08:32  ( -78.65, -58.21)    1.00                29
 04/12/2021   02:59:46   (  78.66, 108.99) 04/12/2021   02:59:28  (  78.65, 109.04)    2.04                18
 04/12/2021   03:50:30   ( -78.64, -83.57) 04/12/2021   03:50:32  ( -78.66, -83.62)    2.47                 2
 04/12/2021   04:41:15   (  78.66,  83.61) 04/12/2021   04:41:28  (  78.66,  83.64)    0.66                13
 04/12/2021   05:32:00   ( -78.68,-109.18) 04/12/2021   05:32:32  ( -78.68,-109.02)    3.57                32
 04/12/2021   06:22:44   (  78.67,  58.24) 04/12/2021   06:23:28  (  78.68,  58.24)    1.09                44
 04/12/2021   07:13:29   ( -78.68,-134.56) 04/12/2021   07:14:32  ( -78.69,-134.42)    3.09                63
 04/12/2021   08:04:13   (  78.67,  32.86) 04/12/2021   08:05:28  (  78.69,  32.84)    2.53                75