Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 12.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-8) LANDSAT-8 Lat/Lon    Distance(km)  Time Diff(sec)
 04/13/2023   22:35:59   (  71.11,-164.39) 04/13/2023   22:37:04  (  71.01,-161.72)   97.03                65
 04/13/2023   23:26:23   ( -70.08,   4.59) 04/13/2023   23:26:49  ( -70.08,   4.52)    2.41                26
 04/14/2023   00:17:07   (  69.96, 172.07) 04/14/2023   00:16:16  (  69.97, 172.02)    1.93                51
 04/16/2023   14:52:35   (  70.35, -47.37) 04/16/2023   14:53:46  (  70.29, -46.93)   17.93                71
 04/16/2023   15:43:13   ( -70.06, 120.41) 04/16/2023   15:43:18  ( -70.07, 120.39)    2.25                 5
 04/16/2023   16:33:57   (  69.94, -72.11) 04/16/2023   16:32:45  (  69.97, -72.11)    2.78                72
 04/19/2023   07:09:21   (  70.13,  68.76) 04/19/2023   07:10:18  (  70.12,  68.70)    2.40                57
 04/19/2023   08:00:03   ( -70.04,-123.78) 04/19/2023   07:59:48  ( -70.02,-123.81)    2.82                15
 04/19/2023   08:50:34   (  69.24,  44.69) 04/19/2023   08:49:26  (  69.30,  42.85)   72.72                68
 04/21/2023   23:26:11   (  70.13,-175.45) 04/21/2023   23:26:47  (  70.12,-175.44)    1.55                36
 04/22/2023   00:16:53   ( -70.04,  -7.99) 04/22/2023   00:16:17  ( -70.01,  -7.95)    3.09                36
 04/24/2023   14:52:29   ( -70.92, 131.76) 04/24/2023   14:53:37  ( -70.82, 133.83)   76.29                68
 04/24/2023   15:42:59   (  70.09, -59.59) 04/24/2023   15:43:15  (  70.11, -59.57)    2.56                16
 04/24/2023   16:33:41   ( -69.99, 107.87) 04/24/2023   16:32:45  ( -70.01, 107.92)    2.63                56