Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and LANDSAT-9
TLE Epoch: 2023 5 14.  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)
 05/14/2023   15:17:43   ( -70.15, 126.60) 05/14/2023   15:18:38  ( -70.13, 126.64)    2.83                55
 05/14/2023   16:08:27   (  70.02, -65.90) 05/14/2023   16:08:05  (  70.03, -65.86)    1.89                22
 05/14/2023   16:58:55   ( -69.20, 102.61) 05/14/2023   16:57:47  ( -69.25, 100.72)   74.77                68
 05/17/2023   07:34:37   ( -70.08,-117.54) 05/17/2023   07:35:05  ( -70.09,-117.53)    0.85                28
 05/17/2023   08:25:21   (  69.96,  49.95) 05/17/2023   08:24:32  (  69.99,  49.97)    3.08                49
 05/19/2023   23:00:51   (  70.17,-169.23) 05/19/2023   23:02:03  (  70.13,-169.22)    3.73                72
 05/19/2023   23:51:32   ( -70.03,  -1.70) 05/19/2023   23:51:33  ( -70.02,  -1.75)    1.95                 1
 05/20/2023   00:42:14   (  69.80, 165.95) 05/20/2023   00:41:01  (  69.86, 165.67)   12.53                73
 05/22/2023   15:17:46   (  70.13, -53.40) 05/22/2023   15:18:29  (  70.14, -53.33)    3.35                43
 05/22/2023   16:08:27   ( -69.98, 114.13) 05/22/2023   16:08:00  ( -69.98, 114.08)    2.29                27
 05/25/2023   06:44:10   ( -70.89,-106.16) 05/25/2023   06:45:18  ( -70.78,-104.15)   74.35                68
 05/25/2023   07:34:41   (  70.09,  62.42) 05/25/2023   07:34:56  (  70.06,  62.45)    3.25                15
 05/25/2023   08:25:22   ( -69.95,-130.05) 05/25/2023   08:24:26  ( -69.96,-130.07)    1.54                56
 05/27/2023   23:00:50   ( -70.12,  10.82) 05/27/2023   23:01:54  ( -70.13,  10.78)    1.61                64
 05/27/2023   23:51:34   (  70.01, 178.30) 05/27/2023   23:51:21  (  70.01, 178.26)    1.49                13
 05/28/2023   00:42:08   ( -69.50, -13.62) 05/28/2023   00:40:57  ( -69.58, -14.70)   43.16                71