Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 6 27.  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)
 06/27/2023   20:25:54   (   0.01,-104.73) (  -0.24,-105.83)  124.87                80
 06/28/2023   20:09:49   (   0.01,-104.74) (   0.81,-101.30)  392.84                80
 06/30/2023   08:31:35   (  -0.02,-104.77) (   0.40,-106.56)  204.67                80
 07/01/2023   08:10:11   (  -0.02,-104.78) (  -0.66,-102.04)  312.32                80
 07/02/2023   20:32:06   (   0.03,-104.77) (  -0.54,-107.34)  293.14                80
 07/03/2023   20:16:01   (   0.03,-104.77) (   0.46,-102.80)  224.04                80
 07/05/2023   08:37:48   (  -0.03,-104.80) (   0.69,-108.08)  373.42                80
 07/06/2023   08:16:23   (  -0.03,-104.80) (  -0.32,-103.54)  143.59                80
 07/07/2023   20:38:18   (   0.04,-104.79) (  -0.87,-108.85)  462.03                80
 07/08/2023   20:22:12   (   0.04,-104.80) (   0.14,-104.31)   55.66                80