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Why isn't noon 'a.m.'?

9:00am, 10:00am, 11:00am, 12:00pm. Shouldn't 12 noon continue the numbers and be 12:00am? And then pm would start with 1:00pm.

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That's just when the switch takes place, that's all.

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Cause 12 am is midnight which starts the day.

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There ya go!
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midnight is morning so it is a.m.

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The"m" means: meridian, or mid day. "A" means anterior or before, "p" is for posterior or past. So, "am" means before mid-day, and "pm" means past mid-day. Hope this helps! ;-)
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12:00 has it's own little category: noon. That's what it is. Anything before it is AM, and anything after it is PM. It's like a base, a foundation of the other times.

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That's just the way it is. aa is a type of lava. mm is a candy. pp is going. ma is mom and pa is dad.

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I love playing aa in scrabble. Whenever people challenge me I do two things. First I explain aa is "a rough cindery lava" (that's the official Scrabble dictionary definition). Usually that is greeted by moans of me cheating by knowing these "special" words.

Then I offer the other players the opportunity to use the official two-letter Scrabble word list throughout the game. Therefore, everyone gets to not only play the two-letter words, but more importantly, learn the two-letter words. Thus, making everyone a better Scrabble player. And who doesn't want to become a better Scrabble player?
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because 12 marks the middle of the 24 hour period. a.m is ante meridiem or before the half day is over and p.m. is post meridiem or after the half day mark. Noon and midnight are the exact middle marks.

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Centuries ago the evening started the new day. The world was dark and God said "let there be light", first came the darkness then came the light. First came the evening then came the day. Romans changed the time so the new day started at 12 am.

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They fixed it to "noon" which was when the sun was at its highest point in the sky. Made much more sense that way.
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The new day starts right after midnight.
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True. But midnight is based on noon. Not the other way around.
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Days should change over night, I'm sure I hear them saying.
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Midnight is based on the point half way between sunset and sunrise to be exact. The day has no bearing on it except the new calendar day starts.
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Hmm. Sunset around here is about 8 right now. Sunrise is at 6. Here's a website proving it:

www.intellicast.com/Local/Weather.aspx?location=USWA0468
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Haha, right but MOST if the time it's mid night. Seasons change and so does the light or darkness. It goes for noon also!
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I still maintain it was easier for the ancients to tell when the sun was directly overhead than figure out a time 'x" when it was halfway between sunset and sunrise.
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I see @Noveltman's point. The sun is highest in the sky at noon. Now the Romans said, we should center our daily time schedule around this fact. It's very consistent and can be mathematically measured. Time is all about math, so we should set our day to be centered around math.

But it would be silly to start the new day right in the middle of the sunlight. At the time people were used to a new day starting when it was dark outside. Thus they took thought to start the day at 12am instead of 12pm. Makes sense.

I just wish they named it 0am. But at the time people were afraid of the number zero. Seriously. Zero meant nothing. People couldn't grasp that concept of an absolute void. Even the intelligent math-loving Greeks banned zero. Give this book a read, "Zero: The Biography of a Dangerous Idea" by Charles Seife.
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It's insane. I took a lot of college courses on early childhood education, and all the math classes told us "Don't tell kids about zero until later. It only confuses them." Then we go in for our practicums, and these teachers from yesteryear are starting off with zero. Harrumph!
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This is a question about religion ?

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One could consider this a question about philosophy as it concerns the essence of time.
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