Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 15.  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)
 12/15/2023   07:09:39   (  70.72,  67.51) 12/15/2023   07:10:47  (  70.61,  69.48)   73.45                68
 12/15/2023   08:00:07   ( -69.89,-123.87) 12/15/2023   08:00:28  ( -69.90,-123.92)    2.02                21
 12/15/2023   08:50:51   (  69.78,  43.61) 12/15/2023   08:49:55  (  69.79,  43.58)    1.95                56
 12/17/2023   23:26:21   (  70.00,-175.57) 12/17/2023   23:27:29  (  69.97,-175.57)    2.92                68
 12/18/2023   00:17:02   ( -69.85,  -8.04) 12/18/2023   00:16:59  ( -69.87,  -8.09)    2.45                 3
 12/18/2023   01:07:42   (  69.53, 159.75) 12/18/2023   01:06:30  (  69.54, 159.11)   25.11                72
 12/20/2023   15:43:16   (  69.97, -59.75) 12/20/2023   15:43:59  (  69.98, -59.69)    2.48                43
 12/20/2023   16:33:57   ( -69.82, 107.79) 12/20/2023   16:33:30  ( -69.82, 107.72)    2.62                27
 12/23/2023   07:09:42   ( -70.89,-112.76) 12/23/2023   07:10:48  ( -70.78,-110.28)   91.07                66
 12/23/2023   08:00:09   (  69.89,  56.14) 12/23/2023   08:00:29  (  69.90,  56.08)    2.65                20
 12/23/2023   08:50:51   ( -69.79,-136.40) 12/23/2023   08:49:59  ( -69.80,-136.43)    1.45                52
 12/25/2023   23:26:20   ( -69.98,   4.46) 12/25/2023   23:27:32  ( -69.98,   4.42)    1.64                72
 12/26/2023   00:17:04   (  69.87, 171.94) 12/26/2023   00:16:59  (  69.87, 171.91)    1.20                 5
 12/26/2023   01:07:43   ( -69.61, -20.37) 12/26/2023   01:06:31  ( -69.66, -20.75)   15.51                72
 12/28/2023   15:43:15   ( -69.96, 120.26) 12/28/2023   15:44:01  ( -69.98, 120.30)    2.74                46
 12/28/2023   16:33:59   (  69.86, -72.27) 12/28/2023   16:33:28  (  69.86, -72.22)    2.29                31