astronomy - How big a coincidence is the Sun and Moon having almost ...
4 Dec 2025 at 3:42am
It's consensus that the very similar apparent sizes of the Moon and the Sun as seen from Earth is a coincidence (as already answered in this site). This provides us with almost exact total solar
How much lux does the Sun emit? - Physics Stack Exchange
4 Dec 2025 at 2:48pm
I want to know how much lux the sun emits on a bright day - I don't mean when one stares directly at the sun, but rather when one walks casually outside when the sun is shinning brightly. Now the
How long until the sun cannot sustain human life on earth?
4 Dec 2025 at 2:30am
The sun will last, at its current brightness for 9 billion more years. How long until the sun gets burned down to the point where it cannot sustain life on Earth anymore? Updated: I am more concer...
How is distance between sun and earth calculated?
5 Dec 2025 at 10:07am
Do you want to know both how the Earth-sun distance is measured and how the speed of light is measured? Those are completely different things. As I asked before, separate threads, please.
What is the simplest way to prove that Earth orbits the Sun?
6 Dec 2025 at 6:06pm
Assume you're talking to someone ignorant of the basic facts of astronomy. How would you prove to them that Earth orbits the Sun? Similarly, how would you prove to them that the Moon orbits Earth?
What is actually meant by 'sun set' and 'sun rise' times, when taking ...
5 Dec 2025 at 12:27am
If this is the case, then when we read things like what time sun sets and rises on websites, books, calendars, other official times, et al? does that mean when we see for example ?sun set at 18:35? is the time denoting the actual sun set taking into account of the mirage or what is visible to us.
Is the distance between the Sun and the Earth increasing?
4 Dec 2025 at 2:26pm
Besides the moon, the sun has a tidal component for the earths oceans, and when that crashes into continents the energy absorbed comes from the potential energy of the sun-earth system. I am not sure how this compares to the distance loss due to the mass and energy radiation of the sun you mentioned.
How fast will the sun become a red giant? - Physics Stack Exchange
6 Dec 2025 at 7:24pm
The sun is currently brightening at about one percent per hundred million years, and that rate is gradually increasing. At some point within roughly a billion years, the planet will cross the threshold for runaway steam-driven global warming, i.e. steam is a greenhouse gas, warms the planet, evaporates more of the oceans etc.
Why doesn't sun go all the way to the horizon during sunset?
6 Dec 2025 at 5:44pm
Everytime I see the pics of suset on beaches the sun appear to go all the way down to the surface of the sea (as shown in the picture) but when I see sunset in my region , the sun disappears well above the horizon. Why does that happen ? EDIT :- A better picture of the sunset.
Why is 1 AU the distance between the Sun and the Earth?
1 Dec 2025 at 6:30am
In the 1800's the AU was connected to: the time average of 1 divided by the Earth-Sun, and that is the reason Gauss's constant occurred (until 2012) in the calculation of the AU.
WHAT IS THIS? This is an unscreened compilation of results from several search engines. The sites listed are not necessarily recommended by Surfnetkids.com.
4 Dec 2025 at 3:42am
It's consensus that the very similar apparent sizes of the Moon and the Sun as seen from Earth is a coincidence (as already answered in this site). This provides us with almost exact total solar
How much lux does the Sun emit? - Physics Stack Exchange
4 Dec 2025 at 2:48pm
I want to know how much lux the sun emits on a bright day - I don't mean when one stares directly at the sun, but rather when one walks casually outside when the sun is shinning brightly. Now the
How long until the sun cannot sustain human life on earth?
4 Dec 2025 at 2:30am
The sun will last, at its current brightness for 9 billion more years. How long until the sun gets burned down to the point where it cannot sustain life on Earth anymore? Updated: I am more concer...
How is distance between sun and earth calculated?
5 Dec 2025 at 10:07am
Do you want to know both how the Earth-sun distance is measured and how the speed of light is measured? Those are completely different things. As I asked before, separate threads, please.
What is the simplest way to prove that Earth orbits the Sun?
6 Dec 2025 at 6:06pm
Assume you're talking to someone ignorant of the basic facts of astronomy. How would you prove to them that Earth orbits the Sun? Similarly, how would you prove to them that the Moon orbits Earth?
What is actually meant by 'sun set' and 'sun rise' times, when taking ...
5 Dec 2025 at 12:27am
If this is the case, then when we read things like what time sun sets and rises on websites, books, calendars, other official times, et al? does that mean when we see for example ?sun set at 18:35? is the time denoting the actual sun set taking into account of the mirage or what is visible to us.
Is the distance between the Sun and the Earth increasing?
4 Dec 2025 at 2:26pm
Besides the moon, the sun has a tidal component for the earths oceans, and when that crashes into continents the energy absorbed comes from the potential energy of the sun-earth system. I am not sure how this compares to the distance loss due to the mass and energy radiation of the sun you mentioned.
How fast will the sun become a red giant? - Physics Stack Exchange
6 Dec 2025 at 7:24pm
The sun is currently brightening at about one percent per hundred million years, and that rate is gradually increasing. At some point within roughly a billion years, the planet will cross the threshold for runaway steam-driven global warming, i.e. steam is a greenhouse gas, warms the planet, evaporates more of the oceans etc.
Why doesn't sun go all the way to the horizon during sunset?
6 Dec 2025 at 5:44pm
Everytime I see the pics of suset on beaches the sun appear to go all the way down to the surface of the sea (as shown in the picture) but when I see sunset in my region , the sun disappears well above the horizon. Why does that happen ? EDIT :- A better picture of the sunset.
Why is 1 AU the distance between the Sun and the Earth?
1 Dec 2025 at 6:30am
In the 1800's the AU was connected to: the time average of 1 divided by the Earth-Sun, and that is the reason Gauss's constant occurred (until 2012) in the calculation of the AU.
WHAT IS THIS? This is an unscreened compilation of results from several search engines. The sites listed are not necessarily recommended by Surfnetkids.com.
