Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 6 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)
 06/14/2023   07:09:17   ( -70.10,-111.28) 06/14/2023   07:10:14  ( -70.09,-111.23)    2.80                57
 06/14/2023   08:00:01   (  69.98,  56.21) 06/14/2023   07:59:41  (  69.99,  56.27)    2.34                20
 06/14/2023   08:50:31   ( -69.26,-135.42) 06/14/2023   08:49:21  ( -69.32,-137.00)   62.48                70
 06/16/2023   23:26:09   ( -70.02,   4.62) 06/16/2023   23:26:44  ( -70.02,   4.56)    2.26                35
 06/17/2023   00:16:53   (  69.90, 172.10) 06/17/2023   00:16:11  (  69.92, 172.06)    2.47                42
 06/19/2023   14:52:29   (  70.51, -47.69) 06/19/2023   14:53:39  (  70.38, -46.68)   40.42                70
 06/19/2023   15:43:03   ( -69.99, 120.43) 06/19/2023   15:43:14  ( -69.99, 120.40)    0.95                11
 06/19/2023   16:33:47   (  69.88, -72.10) 06/19/2023   16:32:41  (  69.89, -72.10)    0.70                66
 06/22/2023   07:09:15   (  70.07,  68.76) 06/22/2023   07:10:14  (  70.05,  68.73)    2.88                59
 06/22/2023   07:59:57   ( -69.97,-123.77) 06/22/2023   07:59:44  ( -69.94,-123.79)    3.54                13
 06/22/2023   08:50:30   (  69.28,  44.54) 06/22/2023   08:49:20  (  69.34,  43.03)   59.77                70
 06/24/2023   23:26:08   (  70.01,-175.38) 06/24/2023   23:26:43  (  70.03,-175.41)    2.15                35
 06/25/2023   00:16:50   ( -69.91,  -7.91) 06/25/2023   00:16:13  ( -69.92,  -7.93)    1.60                37