Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 4 25.  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)
 04/25/2023   20:09:42   (  -0.00,-104.74) (   0.76,-101.17)  405.20                80
 04/27/2023   08:31:28   (   0.00,-104.74) (   0.36,-106.44)  194.34                80
 04/28/2023   08:10:00   (   0.00,-104.73) (  -0.61,-101.90)  322.80                80
 04/29/2023   20:31:54   (   0.00,-104.73) (  -0.55,-107.19)  280.39                80
 04/30/2023   20:15:47   (   0.00,-104.74) (   0.48,-102.66)  237.22                80
 05/02/2023   08:37:31   (  -0.00,-104.74) (   0.69,-107.92)  361.29                80
 05/03/2023   08:16:04   (  -0.00,-104.75) (  -0.29,-103.37)  156.09                80
 05/04/2023   20:37:57   (   0.00,-104.74) (  -0.86,-108.67)  447.38                80
 05/05/2023   20:21:50   (   0.01,-104.74) (   0.13,-104.13)   70.05                80
 05/08/2023   08:24:48   (  -0.02,-104.75) (  -0.02,-104.86)   12.21                80