Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 4 11.  Predictions up to the next  14.0 days:

     Date     Time(GOES-17)   GOES-17 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 04/12/2023   08:10:32   (   0.00,-104.72) (  -0.59,-102.00)  310.47                80
 04/13/2023   20:32:26   (  -0.01,-104.73) (  -0.56,-107.30)  292.66                80
 04/14/2023   20:16:19   (  -0.01,-104.72) (   0.44,-102.76)  224.20                80
 04/16/2023   08:38:04   (   0.01,-104.71) (   0.78,-108.01)  376.79                80
 04/17/2023   08:16:37   (   0.02,-104.71) (  -0.23,-103.47)  140.08                80
 04/18/2023   20:38:32   (   0.01,-104.71) (  -0.91,-108.78)  463.47                80
 04/19/2023   20:22:25   (   0.02,-104.72) (   0.11,-104.24)   53.48                80
 04/22/2023   08:25:24   (  -0.02,-104.71) (   0.03,-104.97)   29.78                80
 04/23/2023   08:03:57   (  -0.02,-104.71) (  -0.99,-100.44)  487.11                80
 04/24/2023   20:25:51   (   0.02,-104.71) (  -0.19,-105.73)  116.11                80