What is the Sun's Angle?

Originally posted by FreakyKBH
At ~93M miles away, what is the degree of angle the sun's light would hit the earth?

An angle is defined by 3 points.
ABC
then you can ask what the angle is at B

What are you asking?

Originally posted by FreakyKBH
What do you mean by measuring the arc of the sun?

The angle it subtends on the sky from the perspective of the earth.

Originally posted by humy
https://en.wikipedia.org/wiki/Sun_path

you must be pretty ignorant.

Goodness.
If I'm ignorant, what does that render you, unable as you are to conceptualize the question?
This doesn't have a single thing to do with the sun's apparent position in the sky or its trajectory.
It asks what the lines of its light would follow, given its distance from the earth.
Those lines should be uniformly straight, yes?

Originally posted by FreakyKBH
At ~93M miles away, what is the degree of angle the sun's light would hit the earth?

Relative to a line connecting their centers it works out to be 0.0048 degrees variation arcross the entire (or nearly entire) hemisphere that is illuminated. Which is effectively 0 deg, or in other words all incident light is basically parallel from the sun.

Calculation:
R = radius of earth = 3959 mi
D = distance from earth to sun = 93,000,000 mi

Angle = 2*asin( R/D ) = 2*asin(3,959/93,000,000) = 0.0048 deg

Originally posted by FreakyKBH

This doesn't have a single thing to do with the sun's apparent position in the sky or its trajectory.

WRONG, it IS just that;

https://en.wikipedia.org/wiki/Sun_path
"...day arc, refers to the daily and seasonal arc-like path that the Sun appears to follow across the sky as the Earth rotates and orbits the Sun. ..."

It asks what the lines of its light would follow, given its distance from the earth.

No it doesn't;

1, day ark doesn't ask questions.

2, the term 'day ark' doesn't refer to the changing directions of the Sun's rays but rather the ark-like changing direction of the appearance of the Sun in the sky; that direction is exactly in the OPPOSITE direction to that of the Sun's rays because Sun's rays travel AWAY from the Sun, not towards it.
It refers to this;
https://en.wikipedia.org/wiki/Sun_path#/media/File😕olargraph_from_Sashegy_-_Budapest,_2014.01.01_-_2014.12.31_(1).jpg

3, the Sun's distance from the Earth has little to do with it because it is not what determines the basic geometry of the day ark although that distance does effect the length of the Earth year;

https://en.wikipedia.org/wiki/Sun_path
"...Sun paths at any latitude and any time of the year can be determined from basic geometry.[4] The Earth's axis of rotation tilts about 23.5 degrees, relative to the plane of Earth's orbit around the Sun. ..."

-it is that that is the main thing that effects the basic day ark geometry.

Originally posted by joe shmo
Which is effectively 0 deg, or in other words all incident light is basically parallel from the sun.

That all depends on why you are measuring it. It ISN'T zero degrees and they are NOT parallel. They are just very close to those such that for SOME situations the discrepancy can be ignored. But if you wanted to measure the distance to the sun, that discrepancy is sufficient to make parallax measurements. In fact parallax across earth can be used to measure the distance to nearby stars.

Originally posted by humy
WRONG, it IS just that;

https://en.wikipedia.org/wiki/Sun_path
"...day arc, refers to the daily and seasonal arc-like path that the Sun appears to follow across the sky as the Earth rotates and orbits the Sun. ...".

Except for the fact that I didn't say 'day arc'.
Arc just means 'angle' and context matters.

The OP and Feakys subsequent posts are far from clear about what he wants to know.

Originally posted by twhitehead
Except for the fact that I didn't say 'day arc'.

.

my apologies; I misread.

The OP and Feakys subsequent posts are far from clear about what he wants to know.

I sure noticed that. Perhaps he doesn't know what he wants to know. Or perhaps he doesn't want to know anything at all. In whichever case, for whatever reason, he is so vague as to make it apparently impossible to determine what, if anything, he wants to know.

Originally posted by twhitehead
That all depends on why you are measuring it. It ISN'T zero degrees and they are NOT parallel. They are just very close to those such that for SOME situations the discrepancy can be ignored. But if you wanted to measure the distance to the sun, that discrepancy is sufficient to make parallax measurements. In fact parallax across earth can be used to measure the distance to nearby stars.

I didn't feel the need to explain that 0.0048... is not 0.00... As far as I can see, he asked for the sunlights angle of incidence on Earth. I said it varies over an small ( non zero ) range across the hemisphere, nothing more nothing less. If he misunderstands that is his problem, not mine.

Originally posted by humy
my apologies; I misread.

The OP and Feakys subsequent posts are far from clear about what he wants to know.

I sure noticed that. Perhaps he doesn't know what he wants to know. Or perhaps he doesn't want to know anything at all. In whichever case, for whatever reason, he is so vague as to make it apparently impossible to determine what, if anything, he wants to know.

It's pretty simple.
The sun's distance from the earth require the light emanating from it to evenly hit the earth, tilt and curvature notwithstanding.
None of its light would be angled one direction or another, but rather, straight parallel lines.

Originally posted by humy
Perhaps he doesn't know what he wants to know. Or perhaps he doesn't want to know anything at all.

As is usually the case with Freaky, he watched a YouTube video, didn't understand it, but thought it said 'all round-earthers proved wrong!', so he ran over here hoping to challenge us with some mind blowing knowledge, but, given that he didn't understand it, is now fumbling to ask the right question.
He will continue for another few pages to hint at possessing some secret knowledge and 'got ya' moment, but never actually get there.

Not unlike the famous eclipses thread from a similar poster.

Originally posted by humy
WRONG, it IS just that;

https://en.wikipedia.org/wiki/Sun_path
"...day arc, refers to the daily and seasonal arc-like path that the Sun appears to follow across the sky as the Earth rotates and orbits the Sun. ..."

It asks what the lines of its light would follow, given its [b]distance from the earth.

No it doesn't;

1, day ark d ...[text shortened]... nd the Sun. ..."

-it is that that is the main thing that effects the basic day ark geometry.[/b]

You are seriously confused.

Originally posted by FreakyKBH
It's pretty simple.
The sun's distance from the earth require the light emanating from it to evenly hit the earth, tilt and curvature notwithstanding

Clearly false.
How do you explain how at any given moment of time it can clearly be observed to be night at one part of the world and day at another part of the world?

Originally posted by FreakyKBH
I'm zeroing in on the angle the light hits the surface from the sun, as a result of their distance from each other.
It makes sense to me that the light ought to be directly parallel.

Depends on where it hits the Earth. Distance is irrelevant.

Originally posted by AThousandYoung
Depends on where it hits the Earth. Distance is irrelevant.

I calculated the angle Earth would substend from the sun, about 18 arc seconds. I should have done it from the sun. Which Joe already did, it comes out about 6200 arc seconds.
My method, with Earth as center, and a 584 million mile circle, the sun as about 880,000 miles diameter so one part in 623 or so, about half a degree wide from Earth's perspective.
Light from one side of the sun is a half degree off from the other side of the sun.
For whatever that is worth.