Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and FY3D
TLE Epoch: 2022 11 29.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(FY3D) FY3D Lat/Lon    Distance(km)  Time Diff(sec)
 12/07/2022   04:57:09   ( -81.20,-132.46) 12/07/2022   04:55:57  ( -81.20,-132.63)    2.86                72
 12/07/2022   05:47:53   (  81.20,  34.84) 12/07/2022   05:46:43  (  81.20,  34.74)    1.62                70
 12/07/2022   06:38:19   ( -81.20,-157.57) 12/07/2022   06:37:28  ( -81.20,-157.72)    2.52                51
 12/07/2022   07:29:03   (  81.20,   9.72) 12/07/2022   07:28:14  (  81.20,   9.65)    1.24                49
 12/07/2022   08:19:30   ( -81.20, 176.94) 12/07/2022   08:19:00  ( -81.20, 176.81)    2.23                30
 12/07/2022   09:10:13   (  81.21, -15.78) 12/07/2022   09:09:45  (  81.20, -15.83)    0.94                28
 12/07/2022   10:00:39   ( -81.20, 151.83) 12/07/2022   10:00:30  ( -81.20, 151.72)    1.87                 9
 12/07/2022   10:51:23   (  81.20, -40.89) 12/07/2022   10:51:16  (  81.20, -40.92)    0.48                 7
 12/07/2022   11:41:49   ( -81.19, 126.71) 12/07/2022   11:42:01  ( -81.20, 126.63)    1.58                12
 12/07/2022   12:32:33   (  81.20, -66.00) 12/07/2022   12:32:47  (  81.20, -66.01)    0.34                14
 12/07/2022   13:23:00   ( -81.20, 101.22) 12/07/2022   13:23:33  ( -81.20, 101.15)    1.23                33
 12/07/2022   14:13:44   (  81.20, -91.50) 12/07/2022   14:14:19  (  81.20, -91.49)    0.34                35
 12/07/2022   15:04:10   ( -81.19,  76.11) 12/07/2022   15:05:04  ( -81.20,  76.06)    0.90                54
 12/07/2022   15:54:54   (  81.20,-116.62) 12/07/2022   15:55:50  (  81.20,-116.58)    0.67                56