Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and FY3D
TLE Epoch: 2022 12 1.  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   04:57:11   ( -81.21,-132.64) 12/07/2022   04:55:56  ( -81.20,-132.47)    3.02                75
 12/07/2022   05:47:54   (  81.20,  35.05) 12/07/2022   05:46:42  (  81.20,  34.90)    2.59                72
 12/07/2022   06:38:21   ( -81.20,-157.75) 12/07/2022   06:37:27  ( -81.20,-157.56)    3.12                54
 12/07/2022   07:29:05   (  81.20,   9.56) 12/07/2022   07:28:14  (  81.20,   9.42)    2.42                51
 12/07/2022   08:19:32   ( -81.21, 176.77) 12/07/2022   08:18:59  ( -81.20, 176.96)    3.27                33
 12/07/2022   09:10:15   (  81.20, -15.54) 12/07/2022   09:09:45  (  81.20, -15.67)    2.25                30
 12/07/2022   10:00:42   ( -81.20, 151.67) 12/07/2022   10:00:31  ( -81.20, 151.48)    3.24                11
 12/07/2022   10:51:26   (  81.20, -41.03) 12/07/2022   10:51:17  (  81.20, -41.15)    2.10                 9
 12/07/2022   11:41:52   ( -81.20, 126.57) 12/07/2022   11:42:02  ( -81.20, 126.39)    3.10                10
 12/07/2022   12:32:36   (  81.20, -66.13) 12/07/2022   12:32:48  (  81.20, -66.24)    1.91                12
 12/07/2022   13:23:02   ( -81.19, 101.47) 12/07/2022   13:23:33  ( -81.20, 101.30)    3.01                31
 12/07/2022   14:13:46   (  81.19, -91.23) 12/07/2022   14:14:19  (  81.20, -91.33)    1.78                33
 12/07/2022   15:04:13   ( -81.20,  75.99) 12/07/2022   15:05:05  ( -81.20,  75.82)    2.87                52
 12/07/2022   15:54:57   (  81.20,-116.72) 12/07/2022   15:55:51  (  81.20,-116.81)    1.58                54
 12/07/2022   16:45:23   ( -81.19,  50.89) 12/07/2022   16:46:36  ( -81.20,  50.73)    2.76                73