Simultaneous Nadir Overpasses (SNOs) between FY3D and NOAA-19
TLE Epoch: 2021 8 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)
 08/13/2021   15:06:38   ( -78.32, 110.15) 08/13/2021   15:05:26  ( -78.30, 110.07)    2.32                72
 08/13/2021   15:57:23   (  78.34, -82.65) 08/13/2021   15:56:21  (  78.31, -82.64)    3.30                62
 08/13/2021   16:48:07   ( -78.32,  84.76) 08/13/2021   16:47:26  ( -78.31,  84.63)    3.06                41
 08/13/2021   17:38:52   (  78.34,-108.03) 08/13/2021   17:38:21  (  78.32,-108.08)    2.66                31
 08/13/2021   18:29:36   ( -78.32,  59.38) 08/13/2021   18:29:26  ( -78.32,  59.19)    4.15                10
 08/13/2021   19:20:21   (  78.34,-133.42) 08/13/2021   19:20:21  (  78.33,-133.51)    2.65                 0
 08/13/2021   20:11:06   ( -78.36,  33.77) 08/13/2021   20:11:26  ( -78.33,  33.76)    3.41                20
 08/13/2021   21:01:50   (  78.35,-158.80) 08/13/2021   21:02:21  (  78.34,-158.95)    3.27                31
 08/13/2021   21:52:35   ( -78.37,   8.39) 08/13/2021   21:53:26  ( -78.34,   8.32)    2.99                51
 08/13/2021   22:43:19   (  78.35, 175.81) 08/13/2021   22:44:20  (  78.38, 175.85)    4.08                61
 08/13/2021   23:34:13   ( -78.71, -19.07) 08/13/2021   23:35:17  ( -78.67, -14.97)   89.52                64