Our ideas on v_rec/c column added to J's calculator

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The discussion centers on the potential addition of a 9th column to Jorrie's cosmic history calculator, specifically regarding the recession speed of a representative galaxy at Hubble distance. Participants express concerns about overwhelming beginners with too much information while recognizing the educational value of such a column. Suggestions include using a clear heading for the column, such as "recession speed" or "vrec/c," to accurately convey its meaning. There is also a call for a user manual or tutorial to help users understand the calculator's functions and the underlying physics concepts. Overall, the idea of adding a recession speed column is seen as beneficial, provided it is implemented thoughtfully.
  • #31
yeah I was thinking of having 3 examples provided it doesn't make the manual too long.
 
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  • #32
Mordred said:
yeah I was thinking of having 3 examples...
Good. From my experience writing first-draft material, I'd urge not to worry about too long and include stuff. Let the editor shorten it by making cuts as he or she wishes.

Exercises are good. I hope you already have 3 picked out. But if you include more and some aren't used in the main manual the others can go into a "supplemental exercises" PDF file attachment. You never know how useful that might be. Let's write down any ideas for exercises we have.

That magic "deja vu" date, when everybody's recession speed was (once before) just the same as what it is today, I think was around year 3 billion. We could use Jorries "tablemaker" to find out the answer more precisely.
 
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