Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and NOAA-19
TLE Epoch: 2023 12 10.  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   15:50:42   ( -73.43, 112.26) 12/17/2023   15:49:36  ( -73.44, 109.19)   97.32                66
 12/17/2023   16:41:36   (  73.84, -81.39) 12/17/2023   16:40:24  (  73.86, -82.51)   34.83                72
 12/17/2023   17:32:25   ( -74.08,  85.35) 12/17/2023   17:31:21  ( -74.09,  85.34)    2.02                64
 12/17/2023   18:23:11   (  74.09,-107.38) 12/17/2023   18:22:18  (  74.08,-107.43)    2.25                53
 12/17/2023   19:13:56   ( -74.13,  59.84) 12/17/2023   19:13:19  ( -74.12,  59.92)    2.65                37
 12/17/2023   20:04:41   (  74.09,-132.76) 12/17/2023   20:04:16  (  74.10,-132.86)    3.06                25
 12/17/2023   20:55:26   ( -74.13,  34.46) 12/17/2023   20:55:17  ( -74.15,  34.50)    2.22                 9
 12/17/2023   21:46:12   (  74.15,-158.27) 12/17/2023   21:46:14  (  74.13,-158.28)    1.94                 2
 12/17/2023   22:36:56   ( -74.14,   9.07) 12/17/2023   22:37:16  ( -74.13,   8.96)    3.63                20
 12/17/2023   23:27:42   (  74.15, 176.34) 12/17/2023   23:28:12  (  74.16, 176.30)    1.45                30
 12/18/2023   00:18:27   ( -74.19, -16.44) 12/18/2023   00:19:13  ( -74.20, -16.33)    3.35                46
 12/18/2023   01:09:13   (  74.21, 150.84) 12/18/2023   01:10:10  (  74.18, 150.88)    2.76                57
 12/18/2023   01:59:57   ( -74.19, -41.82) 12/18/2023   02:01:12  ( -74.18, -41.88)    2.30                75
 12/18/2023   02:50:52   (  74.65, 124.30) 12/18/2023   02:52:00  (  74.59, 126.51)   65.53                68