Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 6 29.  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)
 06/30/2023   08:31:35   (  -0.01,-104.72) (   0.41,-106.56)  209.73                80
 07/01/2023   08:10:10   (  -0.01,-104.71) (  -0.59,-102.02)  305.32                80
 07/02/2023   20:32:06   (   0.01,-104.67) (  -0.56,-107.34)  302.76                80
 07/03/2023   20:16:01   (   0.01,-104.66) (   0.44,-102.80)  212.47                80
 07/05/2023   08:37:47   (  -0.01,-104.66) (   0.77,-108.06)  388.22                80
 07/06/2023   08:16:21   (  -0.01,-104.65) (  -0.23,-103.53)  126.79                80
 07/07/2023   20:38:17   (   0.01,-104.61) (  -0.96,-108.83)  481.55                80
 07/08/2023   20:22:12   (   0.01,-104.60) (   0.10,-104.31)   34.39                80
 07/11/2023   08:25:13   (  -0.01,-104.60) (   0.10,-105.03)   49.82                80
 07/12/2023   08:03:48   (  -0.01,-104.59) (  -0.91,-100.50)  465.46                80