What is the reason for this? Is it because of the earth's rotation?
If the earth did not rotate would that change the "half" to another value?
Hi Rod, please post your source for this so that everyone can read it. Thank you.
@Rod Alexei .... have another try ... think about it from an earth visibility point of view ......
do you now see the reason ?
His thread title is correct
He is asking why .... he just has a misunderstanding of the real reason ... which is what 256bits and myself are trying to coax out of him
Which is why I asked for the source, it often solves the problem.
I don't think there is a "source" as such ... he's just asking "Is it because of the earth's rotation"
as in ... I wonder if this is the reason ....
He didn't state ... " I read somewhere that ....." making asking for a source valid
256bit has given a reason why it isn't by getting him to think about a non rotating earth situation
Exactly, that might be his first clue that his thinking is wrong. I guess I could word it "Have you actually read this anywhere?" But we ask for sources, because many times, people actually come up with some oddball website that they were reading and we need to explain why it's wrong. Or they read a valid website or book, but they misunderstood what they read. I find it best not to assume that they didn't read, see, or hear something that triggered the thought.
Btw, when a thread is started it should be fleshed out with reference to an acceptable source unless it is a well known topic. The body of the thread shouldn't be in the title. And fleshing out the thread with all of the facts becomes a learning thread for other members.
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Here is my source guys. I forgot to mention "at any time". Why is it half not any other value ?
did you read 256bit's comment and ponder it ? ... it seems not
here it is again .....
and my comment
get a tennis ball, baseball etc .... what do you notice about the illumination of the ball if held in front of a lit light globe ?
and all your answers are in that link you provided
Here's my second try. Thanks for your replies !
I assume the tennis ball would be the earth, and the lit globe would be the sun.
Only half the tennis ball would be illuminated. (I guess)
Could it be because at a given time, half of the Earth is exposed to solar radiation and the other half is not?
Well I think I have to agree.
There is, but the amount of high energy radiation coming from sources other than the Sun is tiny.
... so it doesn't matter if the earth rotates on it's axis or not, only ~1/2 is illuminated
The important thing to note is that what the ionisation is doing to the ionosphere's different layers during the day
compared to the absence of that ionising effect at nite
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