Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 7 24.  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)
 07/24/2023   20:21:59   (   0.01,-104.71) (   0.10,-104.27)   50.31                80
 07/27/2023   08:24:59   (  -0.01,-104.73) (   0.06,-105.00)   30.90                80
 07/28/2023   08:03:34   (  -0.01,-104.72) (  -0.97,-100.47)  485.39                80
 07/29/2023   20:25:28   (   0.00,-104.70) (  -0.24,-105.76)  121.62                80
 07/30/2023   20:09:23   (   0.00,-104.69) (   0.79,-101.23)  394.75                80
 08/01/2023   08:31:09   (  -0.00,-104.71) (   0.38,-106.50)  203.47                80
 08/02/2023   08:09:43   (  -0.01,-104.70) (  -0.59,-101.95)  312.64                80
 08/03/2023   20:31:38   (   0.01,-104.67) (  -0.54,-107.26)  294.79                80
 08/04/2023   20:15:31   (   0.01,-104.67) (   0.43,-102.72)  222.00                80
 08/06/2023   08:37:18   (  -0.01,-104.70) (   0.73,-107.99)  374.96                80
 08/07/2023   08:15:52   (  -0.01,-104.70) (  -0.30,-103.46)  141.65                80