Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 1 20.  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)
 01/21/2023   07:10:30   ( -70.14,-111.29) 01/21/2023   07:11:06  ( -70.11,-111.28)    3.11                36
 01/21/2023   08:01:14   (  70.02,  56.19) 01/21/2023   08:00:33  (  70.00,  56.22)    1.98                41
 01/23/2023   22:36:51   (  70.72,-163.77) 01/23/2023   22:38:00  (  70.59,-162.34)   54.67                69
 01/23/2023   23:27:23   ( -70.11,   4.52) 01/23/2023   23:27:37  ( -70.10,   4.58)    2.37                14
 01/24/2023   00:18:07   (  69.99, 172.00) 01/24/2023   00:17:04  (  69.99, 172.07)    2.56                63
 01/26/2023   14:53:32   (  70.13, -47.06) 01/26/2023   14:54:37  (  70.15, -47.11)    3.00                65
 01/26/2023   15:44:14   ( -70.04, 120.40) 01/26/2023   15:44:07  ( -70.05, 120.38)    1.40                 7
 01/26/2023   16:34:51   (  69.55, -71.58) 01/26/2023   16:33:40  (  69.60, -72.59)   39.71                71
 01/29/2023   07:10:25   (  70.13,  68.72) 01/29/2023   07:11:07  (  70.11,  68.71)    2.01                42
 01/29/2023   08:01:07   ( -70.03,-123.82) 01/29/2023   08:00:37  ( -70.01,-123.80)    2.71                30
 01/31/2023   22:36:49   ( -71.02,  15.74) 01/31/2023   22:37:56  ( -70.91,  18.12)   87.60                67
 01/31/2023   23:27:17   (  70.08,-175.45) 01/31/2023   23:27:36  (  70.08,-175.46)    0.47                19
 02/01/2023   00:17:59   ( -69.99,  -7.98) 02/01/2023   00:17:06  ( -69.98,  -7.96)    0.85                53