Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and FY3D
TLE Epoch: 2022 12 4.  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,-132.53) 12/07/2022   04:55:57  ( -81.20,-132.72)    3.28                73
 12/07/2022   05:47:54   (  81.20,  34.82) 12/07/2022   05:46:43  (  81.20,  34.67)    2.54                71
 12/07/2022   06:38:20   ( -81.20,-157.64) 12/07/2022   06:37:28  ( -81.20,-157.82)    3.03                52
 12/07/2022   07:29:04   (  81.20,   9.71) 12/07/2022   07:28:14  (  81.20,   9.58)    2.26                50
 12/07/2022   08:19:30   ( -81.19, 177.25) 12/07/2022   08:18:59  ( -81.20, 177.09)    2.83                31
 12/07/2022   09:10:14   (  81.20, -15.79) 12/07/2022   09:09:45  (  81.20, -15.90)    2.00                29
 12/07/2022   10:00:40   ( -81.20, 151.76) 12/07/2022   10:00:30  ( -81.20, 151.61)    2.57                10
 12/07/2022   10:51:24   (  81.20, -40.89) 12/07/2022   10:51:16  (  81.20, -40.99)    1.69                 8
 12/07/2022   11:41:50   ( -81.19, 126.66) 12/07/2022   11:42:01  ( -81.20, 126.52)    2.35                11
 12/07/2022   12:32:34   (  81.19, -66.00) 12/07/2022   12:32:47  (  81.20, -66.08)    1.46                13
 12/07/2022   13:23:01   ( -81.20, 101.17) 12/07/2022   13:23:33  ( -81.20, 101.04)    2.11                32
 12/07/2022   14:13:45   (  81.20, -91.50) 12/07/2022   14:14:19  (  81.20, -91.56)    1.13                34
 12/07/2022   15:04:11   ( -81.19,  76.06) 12/07/2022   15:05:04  ( -81.20,  75.95)    1.88                53
 12/07/2022   15:54:55   (  81.19,-116.61) 12/07/2022   15:55:50  (  81.20,-116.66)    0.87                55