Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and NOAA-19
TLE Epoch: 2023 9 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)
 09/18/2023   17:18:54   ( -74.00,  88.98) 09/18/2023   17:17:48  ( -74.00,  86.01)   90.82                66
 09/18/2023   18:09:47   (  74.35,-104.59) 09/18/2023   18:08:35  (  74.33,-105.84)   37.66                72
 09/18/2023   19:00:36   ( -74.59,  62.09) 09/18/2023   18:59:35  ( -74.57,  62.05)    2.87                61
 09/18/2023   19:51:22   (  74.60,-130.62) 09/18/2023   19:50:28  (  74.61,-130.56)    1.94                54
 09/18/2023   20:42:06   ( -74.60,  36.70) 09/18/2023   20:41:33  ( -74.61,  36.67)    1.54                33
 09/18/2023   21:32:52   (  74.60,-156.00) 09/18/2023   21:32:27  (  74.60,-156.07)    2.10                25
 09/18/2023   22:23:37   ( -74.65,  11.19) 09/18/2023   22:23:31  ( -74.65,  11.29)    3.11                 6
 09/18/2023   23:14:23   (  74.65, 178.48) 09/18/2023   23:14:25  (  74.64, 178.55)    2.72                 2
 09/19/2023   00:05:07   ( -74.65, -14.20) 09/19/2023   00:05:30  ( -74.64, -14.22)    1.76                23
 09/19/2023   00:55:53   (  74.66, 153.09) 09/19/2023   00:56:23  (  74.68, 153.17)    3.07                30
 09/19/2023   01:46:37   ( -74.66, -39.59) 09/19/2023   01:47:28  ( -74.68, -39.60)    2.31                51
 09/19/2023   02:37:23   (  74.66, 127.71) 09/19/2023   02:38:22  (  74.67, 127.66)    1.67                59
 09/19/2023   03:28:11   ( -74.85, -65.50) 09/19/2023   03:29:24  ( -74.81, -64.71)   23.60                73
 09/19/2023   04:19:04   (  75.20, 100.83) 09/19/2023   04:20:11  (  75.13, 103.54)   77.61                67