Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 24.  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)
 04/25/2023   23:51:23   (  70.05, 178.35) 04/25/2023   23:51:47  (  70.04, 178.28)    3.17                24
 04/26/2023   00:42:05   ( -69.97, -14.21) 04/26/2023   00:41:16  ( -69.98, -14.17)    1.62                49
 04/28/2023   15:17:32   ( -70.38, 126.33) 04/28/2023   15:18:44  ( -70.29, 126.88)   23.02                72
 04/28/2023   16:08:11   (  70.00, -65.78) 04/28/2023   16:08:14  (  70.02, -65.86)    3.34                 3
 04/28/2023   16:58:53   ( -69.92, 101.66) 04/28/2023   16:57:44  ( -69.91, 101.62)    2.17                69
 05/01/2023   07:34:15   ( -70.14,-117.50) 05/01/2023   07:35:12  ( -70.13,-117.46)    1.79                57
 05/01/2023   08:24:59   (  70.03,  49.97) 05/01/2023   08:24:39  (  70.02,  50.03)    2.27                20
 05/01/2023   09:15:29   ( -69.31,-141.65) 05/01/2023   09:14:19  ( -69.36,-143.24)   62.62                70
 05/03/2023   23:51:02   ( -70.08,  -1.61) 05/03/2023   23:51:38  ( -70.09,  -1.63)    2.08                36
 05/04/2023   00:41:46   (  69.97, 165.86) 05/04/2023   00:41:05  (  69.98, 165.86)    1.27                41
 05/06/2023   15:17:17   (  70.65, -54.04) 05/06/2023   15:18:26  (  70.56, -52.69)   50.83                69
 05/06/2023   16:07:50   ( -70.09, 114.17) 05/06/2023   16:08:03  ( -70.07, 114.24)    2.80                13
 05/06/2023   16:58:33   (  69.93, -78.28) 05/06/2023   16:57:30  (  69.96, -78.28)    3.03                63