Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and FY3D
TLE Epoch: 2022 12 3.  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,-132.32) 12/07/2022   04:55:56  ( -81.20,-132.49)    3.03                73
 12/07/2022   05:47:53   (  81.20,  35.02) 12/07/2022   05:46:42  (  81.20,  34.90)    2.23                71
 12/07/2022   06:38:20   ( -81.20,-157.81) 12/07/2022   06:37:28  ( -81.20,-157.97)    2.81                52
 12/07/2022   07:29:04   (  81.20,   9.53) 12/07/2022   07:28:14  (  81.20,   9.42)    1.94                50
 12/07/2022   08:19:30   ( -81.20, 177.09) 12/07/2022   08:18:59  ( -81.20, 176.94)    2.55                31
 12/07/2022   09:10:14   (  81.20, -15.58) 12/07/2022   09:09:45  (  81.20, -15.67)    1.65                29
 12/07/2022   10:00:40   ( -81.19, 151.98) 12/07/2022   10:00:30  ( -81.20, 151.85)    2.35                10
 12/07/2022   10:51:25   (  81.20, -41.07) 12/07/2022   10:51:17  (  81.20, -41.15)    1.40                 8
 12/07/2022   11:41:51   ( -81.20, 126.49) 12/07/2022   11:42:02  ( -81.20, 126.37)    2.07                11
 12/07/2022   12:32:35   (  81.20, -66.18) 12/07/2022   12:32:48  (  81.20, -66.24)    1.06                13
 12/07/2022   13:23:01   ( -81.19, 101.38) 12/07/2022   13:23:33  ( -81.20, 101.28)    1.85                32
 12/07/2022   14:13:45   (  81.19, -91.29) 12/07/2022   14:14:19  (  81.20, -91.34)    0.84                34
 12/07/2022   15:04:12   ( -81.20,  75.89) 12/07/2022   15:05:05  ( -81.20,  75.80)    1.60                53
 12/07/2022   15:54:56   (  81.20,-116.79) 12/07/2022   15:55:51  (  81.20,-116.82)    0.51                55