Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and FY3D
TLE Epoch: 2022 12 2.  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   04:57:10   ( -81.20,-132.42) 12/07/2022   04:55:56  ( -81.20,-132.49)    1.20                74
 12/07/2022   05:47:54   (  81.20,  34.90) 12/07/2022   05:46:42  (  81.20,  34.89)    0.13                72
 12/07/2022   06:38:20   ( -81.20,-157.52) 12/07/2022   06:37:27  ( -81.20,-157.58)    1.12                53
 12/07/2022   07:29:05   (  81.21,   9.41) 12/07/2022   07:28:14  (  81.20,   9.41)    0.45                51
 12/07/2022   08:19:31   ( -81.20, 176.99) 12/07/2022   08:18:59  ( -81.20, 176.94)    0.88                32
 12/07/2022   09:10:15   (  81.20, -15.70) 12/07/2022   09:09:45  (  81.20, -15.68)    0.33                30
 12/07/2022   10:00:41   ( -81.20, 151.89) 12/07/2022   10:00:30  ( -81.20, 151.85)    0.77                11
 12/07/2022   10:51:25   (  81.20, -40.80) 12/07/2022   10:51:16  (  81.20, -40.77)    0.62                 9
 12/07/2022   11:41:52   ( -81.20, 126.40) 12/07/2022   11:42:02  ( -81.20, 126.37)    0.59                10
 12/07/2022   12:32:36   (  81.20, -66.29) 12/07/2022   12:32:48  (  81.20, -66.25)    0.77                12
 12/07/2022   13:23:02   ( -81.20, 101.30) 12/07/2022   13:23:33  ( -81.20, 101.28)    0.42                31
 12/07/2022   14:13:46   (  81.20, -91.40) 12/07/2022   14:14:19  (  81.20, -91.34)    0.97                33
 12/07/2022   15:04:13   ( -81.20,  75.82) 12/07/2022   15:05:05  ( -81.20,  75.80)    0.41                52
 12/07/2022   15:54:57   (  81.20,-116.89) 12/07/2022   15:55:51  (  81.20,-116.82)    1.22                54
 12/07/2022   16:45:23   ( -81.20,  50.71) 12/07/2022   16:46:36  ( -81.20,  50.71)    0.07                73