Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and FY3D
TLE Epoch: 2022 11 30.  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   04:57:08   ( -81.20,-132.27) 12/07/2022   04:55:56  ( -81.20,-132.32)    0.86                72
 12/07/2022   05:47:52   (  81.20,  35.02) 12/07/2022   05:46:42  (  81.20,  35.05)    0.61                70
 12/07/2022   06:38:19   ( -81.20,-157.77) 12/07/2022   06:37:28  ( -81.20,-157.80)    0.48                51
 12/07/2022   07:29:03   (  81.21,   9.51) 12/07/2022   07:28:14  (  81.20,   9.57)    0.96                49
 12/07/2022   08:19:29   ( -81.20, 177.11) 12/07/2022   08:18:59  ( -81.20, 177.11)    0.19                30
 12/07/2022   09:10:13   (  81.20, -15.60) 12/07/2022   09:09:45  (  81.20, -15.52)    1.35                28
 12/07/2022   10:00:40   ( -81.20, 151.62) 12/07/2022   10:00:31  ( -81.20, 151.63)    0.45                 9
 12/07/2022   10:51:24   (  81.21, -41.10) 12/07/2022   10:51:17  (  81.20, -41.00)    1.80                 7
 12/07/2022   11:41:49   ( -81.20, 126.50) 12/07/2022   11:42:01  ( -81.20, 126.54)    0.65                12
 12/07/2022   12:32:33   (  81.20, -66.22) 12/07/2022   12:32:47  (  81.20, -66.09)    2.17                14
 12/07/2022   13:22:59   ( -81.19, 101.39) 12/07/2022   13:23:32  ( -81.20, 101.45)    1.07                33
 12/07/2022   14:13:43   (  81.20, -91.34) 12/07/2022   14:14:18  (  81.20, -91.18)    2.59                35
 12/07/2022   15:04:10   ( -81.20,  75.89) 12/07/2022   15:05:04  ( -81.20,  75.97)    1.39                54
 12/07/2022   15:54:54   (  81.20,-116.84) 12/07/2022   15:55:50  (  81.20,-116.66)    3.01                56