Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 4 7.  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)
 04/08/2023   14:52:44   ( -70.16, 132.89) 04/08/2023   14:53:54  ( -70.14, 132.86)    2.56                70
 04/08/2023   15:43:28   (  70.05, -59.63) 04/08/2023   15:43:21  (  70.04, -59.64)    1.29                 7
 04/08/2023   16:34:06   ( -69.75, 108.14) 04/08/2023   16:32:53  ( -69.81, 107.68)   18.93                73
 04/11/2023   07:09:34   ( -70.12,-111.26) 04/11/2023   07:10:19  ( -70.13,-111.27)    1.12                45
 04/11/2023   08:00:18   (  70.01,  56.22) 04/11/2023   07:59:46  (  70.02,  56.22)    1.31                32
 04/13/2023   22:35:56   (  70.91,-164.06) 04/13/2023   22:37:03  (  70.79,-162.03)   75.03                67
 04/13/2023   23:26:24   ( -70.08,   4.58) 04/13/2023   23:26:44  ( -70.08,   4.55)    1.20                20
 04/14/2023   00:17:08   (  69.97, 172.05) 04/14/2023   00:16:11  (  69.97, 172.04)    1.04                57
 04/16/2023   14:52:31   (  70.15, -47.06) 04/16/2023   14:53:37  (  70.16, -47.06)    1.11                66
 04/16/2023   15:43:13   ( -70.06, 120.40) 04/16/2023   15:43:07  ( -70.05, 120.41)    0.76                 6
 04/16/2023   16:33:50   (  69.58, -71.58) 04/16/2023   16:32:39  (  69.66, -72.48)   36.09                71
 04/19/2023   07:09:20   (  70.09,  68.82) 04/19/2023   07:10:01  (  70.11,  68.75)    3.28                41
 04/19/2023   08:00:02   ( -69.99,-123.71) 04/19/2023   07:59:31  ( -70.00,-123.77)    2.13                31