Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 7 19.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(LANDSAT-9) LANDSAT-9 Lat/Lon    Distance(km)  Time Diff(sec)
 07/20/2023   07:34:17   ( -70.04,-117.48) 07/20/2023   07:35:06  ( -70.05,-117.46)    2.00                49
 07/20/2023   08:25:01   (  69.93,  49.99) 07/20/2023   08:24:34  (  69.90,  49.97)    3.29                27
 07/20/2023   09:15:25   ( -68.88,-141.19) 07/20/2023   09:14:19  ( -68.95,-143.66)   98.88                66
 07/22/2023   23:51:09   ( -69.99,  -1.64) 07/22/2023   23:51:35  ( -70.02,  -1.62)    2.57                26
 07/23/2023   00:41:53   (  69.89, 165.83) 07/23/2023   00:41:03  (  69.86, 165.81)    3.44                50
 07/25/2023   15:17:21   (  70.17, -53.44) 07/25/2023   15:18:33  (  70.12, -53.21)   10.09                72
 07/25/2023   16:08:01   ( -69.96, 114.19) 07/25/2023   16:08:04  ( -69.95, 114.19)    0.76                 3
 07/25/2023   16:58:44   (  69.80, -78.27) 07/25/2023   16:57:32  (  69.79, -78.40)    5.00                72
 07/28/2023   07:34:11   (  70.04,  62.53) 07/28/2023   07:35:02  (  70.03,  62.55)    1.14                51
 07/28/2023   08:24:53   ( -69.93,-129.99) 07/28/2023   08:24:32  ( -69.92,-129.97)    1.91                21
 07/28/2023   09:15:20   (  68.93,  38.75) 07/28/2023   09:14:14  (  68.98,  36.42)   93.58                66
 07/30/2023   23:51:01   (  69.97, 178.42) 07/30/2023   23:51:29  (  69.97, 178.35)    2.40                28
 07/31/2023   00:41:43   ( -69.86, -14.11) 07/31/2023   00:40:59  ( -69.86, -14.16)    2.00                44