Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2025 4 13.  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)
 04/13/2025   14:03:02   (  71.04, -35.86) 04/13/2025   14:04:09  (  70.90, -33.66)   81.27                67
 04/13/2025   14:53:30   ( -70.19, 132.84) 04/13/2025   14:53:50  ( -70.18, 132.91)    2.81                20
 04/13/2025   15:44:13   (  70.05, -59.64) 04/13/2025   15:43:18  (  70.03, -59.67)    3.15                55
 04/16/2025   06:19:38   (  70.27,  81.18) 04/16/2025   06:20:48  (  70.25,  81.26)    3.48                70
 04/16/2025   07:10:20   ( -70.15,-111.32) 04/16/2025   07:10:18  ( -70.14,-111.27)    2.21                 2
 04/16/2025   08:01:00   (  69.86,  56.44) 04/16/2025   07:59:47  (  69.92,  56.07)   15.72                73
 04/18/2025   22:36:27   (  70.20,-162.91) 04/18/2025   22:37:15  (  70.22,-162.91)    2.11                48
 04/18/2025   23:27:10   ( -70.13,   4.51) 04/18/2025   23:26:45  ( -70.10,   4.56)    3.32                25
 04/21/2025   14:53:16   (  70.19, -47.11) 04/21/2025   14:53:40  (  70.19, -47.06)    1.76                24
 04/21/2025   15:43:58   ( -70.06, 120.40) 04/21/2025   15:43:10  ( -70.08, 120.41)    1.62                48
 04/24/2025   06:19:25   ( -70.42, -99.00) 04/24/2025   06:20:37  ( -70.34, -98.60)   17.60                72
 04/24/2025   07:10:05   (  70.14,  68.76) 04/24/2025   07:10:06  (  70.11,  68.72)    3.18                 1
 04/24/2025   08:00:47   ( -70.02,-123.74) 04/24/2025   07:59:36  ( -70.01,-123.80)    2.43                71
 04/26/2025   22:36:11   ( -70.23,  17.10) 04/26/2025   22:37:03  ( -70.22,  17.12)    1.48                52
 04/26/2025   23:26:54   (  70.11,-175.40) 04/26/2025   23:26:30  (  70.11,-175.40)    0.20                24