Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 12 10.  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)
 12/12/2023   15:43:12   ( -69.92, 120.32) 12/12/2023   15:43:57  ( -69.93, 120.25)    2.55                45
 12/12/2023   16:33:56   (  69.81, -72.20) 12/12/2023   16:33:24  (  69.82, -72.25)    2.00                32
 12/15/2023   07:09:40   (  70.76,  67.45) 12/15/2023   07:10:47  (  70.63,  69.51)   77.12                67
 12/15/2023   08:00:08   ( -69.93,-123.92) 12/15/2023   08:00:28  ( -69.92,-123.88)    1.44                20
 12/15/2023   08:50:52   (  69.82,  43.56) 12/15/2023   08:49:55  (  69.81,  43.61)    2.17                57
 12/17/2023   23:26:21   (  69.98,-175.55) 12/17/2023   23:27:29  (  70.00,-175.53)    2.23                68
 12/18/2023   00:17:03   ( -69.88,  -8.08) 12/18/2023   00:16:59  ( -69.90,  -8.04)    2.51                 4
 12/18/2023   01:07:42   (  69.51, 159.78) 12/18/2023   01:06:30  (  69.57, 159.15)   25.27                72
 12/20/2023   15:43:15   (  69.95, -59.72) 12/20/2023   15:43:59  (  69.96, -59.71)    1.46                44
 12/20/2023   16:33:57   ( -69.85, 107.75) 12/20/2023   16:33:29  ( -69.86, 107.78)    2.17                28
 12/23/2023   07:09:43   ( -70.91,-112.79) 12/23/2023   07:10:49  ( -70.78,-110.28)   92.83                66
 12/23/2023   08:00:10   (  69.92,  56.09) 12/23/2023   08:00:30  (  69.90,  56.08)    1.93                20
 12/23/2023   08:50:52   ( -69.81,-136.44) 12/23/2023   08:50:00  ( -69.80,-136.42)    1.27                52