Simultaneous Nadir Overpasses (SNOs) between GOES-17 and NOAA-21
TLE Epoch: 2023 10 6.  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)
 10/06/2023   20:33:01   (   0.02,-104.69) (   0.00,-107.42)  303.05                 0
 10/07/2023   20:15:26   (   0.02,-104.69) (   0.47,-102.76)  220.40                80
 10/09/2023   08:37:13   (  -0.02,-104.71) (   0.73,-108.02)  377.82                80
 10/10/2023   08:15:47   (  -0.01,-104.71) (  -0.27,-103.49)  138.81                80
 10/11/2023   20:37:43   (   0.01,-104.69) (  -0.92,-108.79)  467.29                80
 10/12/2023   20:21:37   (   0.00,-104.69) (   0.09,-104.25)   49.84                80
 10/15/2023   08:24:38   (   0.01,-104.72) (   0.08,-104.98)   30.43                80
 10/16/2023   08:03:12   (   0.02,-104.72) (  -0.94,-100.45)  486.48                80
 10/17/2023   20:25:08   (  -0.03,-104.69) (  -0.23,-105.75)  119.92                80
 10/18/2023   20:09:01   (  -0.03,-104.69) (   0.73,-101.21)  396.77                80
 10/20/2023   08:30:48   (   0.03,-104.71) (   0.43,-106.47)  201.08                80