Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-8
TLE Epoch: 2023 1 17.  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)
 01/18/2023   14:53:36   ( -70.14, 132.94) 01/18/2023   14:54:31  ( -70.15, 132.93)    1.39                55
 01/18/2023   15:44:20   (  70.02, -59.58) 01/18/2023   15:43:58  (  70.04, -59.58)    2.55                22
 01/18/2023   16:34:48   ( -69.19, 108.94) 01/18/2023   16:33:40  ( -69.27, 107.00)   77.16                68
 01/21/2023   07:10:29   ( -70.10,-111.23) 01/21/2023   07:10:57  ( -70.09,-111.26)    1.35                28
 01/21/2023   08:01:13   (  69.98,  56.25) 01/21/2023   08:00:24  (  69.98,  56.23)    0.87                49
 01/23/2023   22:36:40   (  70.16,-162.88) 01/23/2023   22:37:52  (  70.15,-162.91)    1.52                72
 01/23/2023   23:27:22   ( -70.07,   4.58) 01/23/2023   23:27:22  ( -70.04,   4.57)    2.99                 0
 01/24/2023   00:18:03   (  69.80, 172.29) 01/24/2023   00:16:50  (  69.87, 171.98)   14.63                73
 01/26/2023   14:53:32   (  70.10, -47.01) 01/26/2023   14:54:16  (  70.12, -47.06)    2.65                44
 01/26/2023   15:44:14   ( -70.00, 120.45) 01/26/2023   15:43:46  ( -70.01, 120.42)    1.23                28
 01/29/2023   06:19:53   ( -70.89, -99.81) 01/29/2023   06:21:01  ( -70.76, -97.86)   72.45                68
 01/29/2023   07:10:24   (  70.10,  68.75) 01/29/2023   07:10:38  (  70.09,  68.81)    2.26                14
 01/29/2023   08:01:06   ( -70.00,-123.78) 01/29/2023   08:00:08  ( -69.99,-123.71)    3.33                58