I have one idea to add that I did not see mentioned.At the beginning is more "space and time" than in the beginning, which is time (he said, scratching his head).
At the beginning of the book - OK.
In the beginning of the book - ?
At the beginning of the year - OK.
In the beginning of the year - ?
I'm kind of stuck because "In the beginning ..." has an immediate biblical resonance. I see from a quick Google that this is very common. The examples I see are directly or by allusion referring to the Christian Bible.
I might suggest also that "At ..." is a point, "In ..." is a period.
Edit: Thanks again, river, for finding that. I missed it somehow. Good to see that I didn't contradict myself
Yes you're right. If I were you, I would ignore 16th century English and move into the 21st century!Cause now I got the impression that "in the beginning" is only used when talking about something really grandiloquent...
Hello Suzi,Hi as far as I know they are interchangeable.
Hello Paul,At the beginning is always followed by "of"