Simultaneous Nadir Overpasses (SNOs) between NOAA-21 and METOP-B
TLE Epoch: 2023 4 29.  Predictions up to the next  14.0 days:

     Date     Time(NOAA-21) NOAA-21 Lat/Lon Date Time(METOP-B) METOP-B Lat/Lon    Distance(km)  Time Diff(sec)
 05/12/2023   15:06:05   (  73.46, -56.41) 05/12/2023   15:07:11  (  73.43, -53.65)   87.74                66
 05/12/2023   15:56:47   ( -73.36, 111.14) 05/12/2023   15:57:55  ( -73.33, 113.45)   73.93                68
 05/12/2023   16:47:29   (  73.17, -81.13) 05/12/2023   16:48:39  (  73.10, -79.71)   46.39                70
 05/12/2023   17:38:11   ( -73.06,  86.41) 05/12/2023   17:39:23  ( -73.00,  87.41)   32.90                72
 05/12/2023   18:28:53   (  72.87,-105.86) 05/12/2023   18:30:06  (  72.82,-105.64)    8.97                73
 05/12/2023   19:19:35   ( -72.77,  61.67) 05/12/2023   19:20:49  ( -72.77,  61.59)    2.85                74
 05/12/2023   20:10:21   (  72.77,-131.03) 05/12/2023   20:11:28  (  72.80,-131.03)    2.97                67
 05/12/2023   21:01:05   ( -72.77,  36.29) 05/12/2023   21:02:10  ( -72.80,  36.31)    3.52                65
 05/12/2023   21:51:51   (  72.78,-156.41) 05/12/2023   21:52:50  (  72.77,-156.42)    0.22                59
 05/12/2023   22:42:35   ( -72.77,  10.91) 05/12/2023   22:43:32  ( -72.78,  10.92)    0.47                57
 05/12/2023   23:33:21   (  72.78, 178.20) 05/12/2023   23:34:12  (  72.75, 178.19)    3.41                51
 05/13/2023   00:24:05   ( -72.78, -14.48) 05/13/2023   00:24:54  ( -72.75, -14.47)    2.82                49
 05/13/2023   01:14:51   (  72.78, 152.82) 05/13/2023   01:15:33  (  72.78, 152.91)    3.09                42
 05/13/2023   02:05:35   ( -72.78, -39.86) 05/13/2023   02:06:15  ( -72.78, -39.76)    3.37                40
 05/13/2023   02:56:20   (  72.74, 127.54) 05/13/2023   02:56:55  (  72.75, 127.52)    1.71                35