Redshifts and important early events

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The discussion focuses on identifying redshifts for key events in the early universe, specifically noting z = 1100 for the recombination era and z = 15-20 for the reionization era. The user is seeking information on the redshift associated with the "Dark Ages" and requests assistance in finding this data. Additionally, they are looking for beginner-level resources on how redshift calculations are performed. The conversation emphasizes the importance of understanding these early cosmic events and their corresponding redshifts. Overall, the thread highlights a quest for knowledge about the early universe's timeline.
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Hi,

I am researching several historic eras of the early universe and part of what I need to find is at what redshifts these events occurred. I have z = 1100 for the recombination era and z = 15-20 for the reinonization era. I haven't been able to turn up this info the "Dark Ages" yet. Any help is appreciated. And I'd be grateful if someone could point me to a good site (beginner level) on how these redshift numbers are calculated. Thank you.
 
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Thanks, Ambitwistor. I don't know what I'd do without you! I appreciate your help now as well as in previous posts.
 

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