Simultaneous Nadir Overpasses (SNOs) between GOES-18 and NOAA-21
TLE Epoch: 2023 6 26.  Predictions up to the next  14.0 days:

     Date     Time(GOES-18)   GOES-18 Lat/Lon  NOAA-21 Lat/Lon    Distance(km)  Time Diff(sec)
 06/26/2023   22:29:13   (  -0.01,-137.02) (   0.18,-136.05)  109.18                80
 06/28/2023   10:48:20   (   0.00,-137.04) (   0.97,-141.33)  489.06                80
 06/29/2023   10:32:16   (  -0.01,-137.04) (  -0.08,-136.80)   27.59                80
 07/01/2023   22:32:46   (   0.02,-137.03) (  -0.13,-137.57)   62.11                80
 07/02/2023   22:16:41   (   0.02,-137.02) (   0.93,-133.04)  454.03                80
 07/04/2023   10:35:47   (  -0.02,-137.02) (   0.27,-138.31)  146.14                80
 07/05/2023   10:19:42   (  -0.01,-137.01) (  -0.73,-133.77)  369.67                80
 07/06/2023   22:38:57   (   0.00,-136.99) (  -0.46,-139.07)  237.23                80
 07/07/2023   22:22:52   (  -0.01,-136.98) (   0.55,-134.54)  278.57                80
 07/09/2023   10:41:58   (   0.01,-136.98) (   0.65,-139.80)  322.02                80