Simultaneous Nadir Overpasses (SNOs) between FY3D and NOAA-19
TLE Epoch: 2021 7 18.  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)
 07/30/2021   21:17:44   ( -78.35,  17.10) 07/30/2021   21:16:38  ( -78.36,  17.08)    1.33                66
 07/30/2021   22:08:28   (  78.34,-175.56) 07/30/2021   22:07:32  (  78.36,-175.66)    2.80                56
 07/30/2021   22:59:13   ( -78.35,  -8.29) 07/30/2021   22:58:38  ( -78.37,  -8.35)    2.57                35
 07/30/2021   23:49:58   (  78.38, 158.83) 07/30/2021   23:49:32  (  78.37, 158.91)    2.49                26
 07/31/2021   00:40:43   ( -78.39, -33.90) 07/31/2021   00:40:38  ( -78.38, -33.79)    2.83                 5
 07/31/2021   01:31:27   (  78.39, 133.45) 07/31/2021   01:31:32  (  78.38, 133.48)    1.17                 5
 07/31/2021   02:22:12   ( -78.39, -59.28) 07/31/2021   02:22:38  ( -78.39, -59.22)    1.52                26
 07/31/2021   03:12:56   (  78.39, 108.06) 07/31/2021   03:13:32  (  78.39, 108.05)    0.39                36
 07/31/2021   04:03:41   ( -78.40, -84.67) 07/31/2021   04:04:38  ( -78.40, -84.65)    0.55                57
 07/31/2021   04:54:25   (  78.39,  82.68) 07/31/2021   04:55:32  (  78.40,  82.62)    1.59                67