Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 4 22.  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)
 04/23/2023   07:34:35   (  70.12,  62.47) 04/23/2023   07:35:18  (  70.13,  62.54)    3.64                43
 04/23/2023   08:25:16   ( -69.98,-130.01) 04/23/2023   08:24:49  ( -69.96,-130.07)    2.82                27
 04/25/2023   23:51:24   (  70.08, 178.30) 04/25/2023   23:51:47  (  70.06, 178.31)    2.81                23
 04/26/2023   00:42:05   ( -69.95, -14.17) 04/26/2023   00:41:17  ( -69.95, -14.21)    1.53                48
 04/28/2023   15:17:32   ( -70.38, 126.32) 04/28/2023   15:18:44  ( -70.28, 126.86)   23.55                72
 04/28/2023   16:08:12   (  70.06, -65.88) 04/28/2023   16:08:13  (  70.06, -65.80)    2.76                 1
 04/28/2023   16:58:53   ( -69.92, 101.65) 04/28/2023   16:57:43  ( -69.95, 101.67)    2.92                70
 05/01/2023   07:34:16   ( -70.11,-117.46) 05/01/2023   07:35:13  ( -70.14,-117.45)    3.46                57
 05/01/2023   08:25:00   (  70.00,  50.01) 05/01/2023   08:24:40  (  70.03,  50.04)    3.30                20
 05/01/2023   09:15:30   ( -69.28,-141.61) 05/01/2023   09:14:21  ( -69.31,-143.30)   66.60                69
 05/03/2023   23:51:05   ( -70.11,  -1.66) 05/03/2023   23:51:40  ( -70.08,  -1.65)    3.08                35
 05/04/2023   00:41:48   (  69.95, 165.88) 05/04/2023   00:41:07  (  69.96, 165.83)    2.76                41
 05/06/2023   15:17:20   (  70.63, -54.01) 05/06/2023   15:18:29  (  70.53, -52.75)   48.13                69
 05/06/2023   16:07:53   ( -70.06, 114.20) 05/06/2023   16:08:06  ( -70.04, 114.18)    2.54                13
 05/06/2023   16:58:37   (  69.96, -78.34) 05/06/2023   16:57:32  (  69.98, -78.26)    3.59                65