Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 5 12.  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)
 05/13/2023   07:09:15   ( -70.16,-111.30) 05/13/2023   07:10:03  ( -70.17,-111.26)    1.73                48
 05/13/2023   07:59:59   (  70.03,  56.20) 05/13/2023   07:59:31  (  70.01,  56.16)    2.89                28
 05/15/2023   22:35:43   (  70.96,-164.15) 05/15/2023   22:36:50  (  70.86,-161.98)   79.45                67
 05/15/2023   23:26:10   ( -70.09,   4.57) 05/15/2023   23:26:32  ( -70.10,   4.52)    2.03                22
 05/16/2023   00:16:54   (  69.97, 172.06) 05/16/2023   00:15:59  (  69.99, 172.01)    3.28                55
 05/18/2023   14:52:23   (  70.17, -47.12) 05/18/2023   14:53:29  (  70.16, -47.15)    2.21                66
 05/18/2023   15:43:05   ( -70.09, 120.33) 05/18/2023   15:42:58  ( -70.10, 120.41)    3.30                 7
 05/18/2023   16:33:42   (  69.59, -71.63) 05/18/2023   16:32:31  (  69.66, -72.56)   37.04                71
 05/21/2023   07:09:18   (  70.13,  68.71) 05/21/2023   07:09:56  (  70.13,  68.69)    0.88                38
 05/21/2023   08:00:00   ( -70.04,-123.83) 05/21/2023   07:59:26  ( -70.02,-123.83)    2.05                34
 05/23/2023   22:35:39   ( -70.74,  16.21) 05/23/2023   22:36:48  ( -70.62,  17.65)   54.39                69
 05/23/2023   23:26:13   (  70.10,-175.47) 05/23/2023   23:26:22  (  70.12,-175.44)    3.04                 9
 05/24/2023   00:16:55   ( -70.01,  -8.02) 05/24/2023   00:15:52  ( -70.02,  -7.95)    2.90                63