Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and NOAA-19
TLE Epoch: 2023 12 6.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(NOAA-19) NOAA-19 Lat/Lon    Distance(km)  Time Diff(sec)
 12/17/2023   15:50:41   ( -73.43, 112.26) 12/17/2023   15:49:35  ( -73.44, 109.20)   97.00                66
 12/17/2023   16:41:35   (  73.85, -81.40) 12/17/2023   16:40:23  (  73.85, -82.52)   34.43                72
 12/17/2023   17:32:24   ( -74.08,  85.34) 12/17/2023   17:31:20  ( -74.09,  85.35)    1.42                64
 12/17/2023   18:23:10   (  74.10,-107.39) 12/17/2023   18:22:17  (  74.07,-107.44)    3.15                53
 12/17/2023   19:13:55   ( -74.13,  59.83) 12/17/2023   19:13:18  ( -74.12,  59.93)    3.23                37
 12/17/2023   20:04:40   (  74.10,-132.78) 12/17/2023   20:04:15  (  74.10,-132.86)    2.55                25
 12/17/2023   20:55:25   ( -74.14,  34.45) 12/17/2023   20:55:16  ( -74.15,  34.51)    1.96                 9
 12/17/2023   21:46:11   (  74.16,-158.29) 12/17/2023   21:46:13  (  74.13,-158.28)    3.54                 2
 12/17/2023   22:36:55   ( -74.14,   9.06) 12/17/2023   22:37:14  ( -74.17,   9.08)    3.40                19
 12/17/2023   23:27:41   (  74.16, 176.32) 12/17/2023   23:28:11  (  74.15, 176.29)    1.53                30
 12/18/2023   00:18:26   ( -74.20, -16.45) 12/18/2023   00:19:12  ( -74.20, -16.34)    3.40                46
 12/18/2023   01:09:11   (  74.17, 150.94) 12/18/2023   01:10:09  (  74.18, 150.87)    2.40                58
 12/18/2023   01:59:56   ( -74.20, -41.83) 12/18/2023   02:01:11  ( -74.18, -41.88)    2.94                75
 12/18/2023   02:50:51   (  74.66, 124.28) 12/18/2023   02:51:59  (  74.59, 126.50)   66.11                68