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Questions tagged [the-moon]

Questions regarding Earth's only natural satellite.

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Why is the shape of the Moon spherical? [duplicate]

The Moon does not rotate on its own axis. If I am right, for something to gain a spherical shape it has to rotate on its own axis. We know that the Moon does not rotate on its own axis. How can this ...
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1answer
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Precise declination of Moon

The moon follows 5.14 deg inclined path. the ecliptic and the Moon's path coincide are called 'nodes', and they travel around the ecliptic in a period of 18.66 years. Once every 18.66 years, the ...
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2answers
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How could the Moon have arisen from a collision - what would make for an elliptical orbit?

One serious theory advanced for the creation of Earth's moon is that it resulted from a collision. However matter would be thrown off in all directions and some will fall back. How could a mass of ...
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4answers
222 views

Moon is a planet by “Clearing the neighborhood” condition?

Whether the Moon (Earth's natural satellite) is a planet is an old debate in planetary science. Though I do not agree that Moon is a planet, I found something difficult to clearly understand. ...
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Lunar illumination (percentage) data on an eclipse day needed

I am looking for the information on the percentage illumination of the moon during the different stages of a total lunar eclipse. Is there a database from where I can acquire information of lunar ...
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Blood moon, what are the bright light reflections that occur briefly?

During the blood moon some time back, I observed light reflections along the edge of the moon, isolated to a very small region, and recurring at different positions along the edge of the moon. What ...
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0answers
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what is the net effect of nodal and apsidal lunar precession?

In apsidal lunar precession, the moon's elliptic major axis precesses eastward and completes one revolution eastward in 8.85 years. Because the orbit is inclined relative to the ecliptic, basic ...
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0answers
52 views

Where on Earth can moon rise on the meridian?

Somewhat related to this my picture showing only diurnal motion but Moon—seen from Earth—has a rapid motion with respect to the inertial celestial sphere, unlike stars and planets. Its motion relative ...
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1answer
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Calculating the Size of Earth in the Apollo 8 Earthrise Photo

I was debating with someone online (I know, great way to get nowhere fast) regarding the size of Earth as it appears in the famous 'Earthrise' photos from Apollo 8. Below is an accurate (almost pixel-...
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Polar circle for the moon

The polar circle is the limit for how far north or south the sun will shine 24h. But is there a similar limit for the moon?
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1answer
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Why is the moon so large in this picture from Athens

I don't undertand why the moon can be that big a few hundred miles sout of where I am in London... And when I went to Greece, even Africa, the moon wasn't so large...
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6answers
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Puzzling quotes from astronauts about earth size

I have no doubt that we have been to the moon. This question has nothing to do with a moon landing hoax. But, there are two quotes from two different astronauts regarding the size of the earth as ...
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1answer
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How could original astronomers have used the clouds to find distances? [closed]

I was looking at a very bright moon tonight through light cloud cover and saw a halo of light far bigger than the moon imposed on the clouds. Almost in a conic shape by comparison. I was wondering if ...
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2answers
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What is the nature of “rock vapor” in this description of the formation of the Moon?

The NPR News item MacArthur Fellow And Planetary Scientist Sarah Stewart Discusses How The Moon Was Formed and audio podcast begins: Ari Shapiro, Host: Sarah Stewart likes to think about what ...
3
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1answer
42 views

Could the E.H.T. produce an image of the human artifacts on the moon?

Two days ago the New York Times featured the Event Horizon Telescope (E.H.T.), a huge virtual radio telescope emerging from combining data from several dishes scattered around the world. While the E.H....
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3answers
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Could the Moon sit on the Earth?

Let say that the Earth's Moon was knocked out of orbit and landed on the Earth with some damage but not world ending. Would Earth's atmosphere envelop to include the Moon? Would the moon sink into the ...
2
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1answer
586 views

What is the Terra phase?

Does the Moon have a night and day like Earth? When sitting on the Moon and viewing the Earth what does it look like when the Earth goes through phases like the Lunar Phase? How does the sun travel ...
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2answers
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What are the craters on the moon with peaks in the middle of them?

Was taking some extremely amatuer pictures of the moon from my cheap telescope with my camera phone... You see the crater Im talking about? Top right.The one with a little nub in the middle- which Im ...
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4answers
103 views

Difference in time between sunset and moonrise on a full moon

So as a Sailor I have experienced some times where sunset and moonrise are very close together (this happens when it's full moon) which is particularly beautiful. I assumed that this was always the ...
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1answer
108 views

How does the Moon move in the “night” sky as seen from the poles?

A photo in the NYTimes article Ice Surveys and Neckties at Dinner: Here’s Life at an Arctic Outpost has got me thinking. During the winter months at either the north or south pole, when it is ...
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2answers
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How to calculate exact angle to the moon?

I am building some device as a gift for my girlfriend. For this device to work, I need to be able to calculate the angle to which I should look towards (3D angle), in order to see the moon. This ...
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2answers
133 views

Why does the half moon appear to have a “nose”?

Yesterday evening, the moon from my place looked like this: Basically, instead of the crescent shape I am used to it looked like there was three tips: one at each extremity (as usual) and one in the ...
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1answer
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Celestron Astromaster EQ130

I recently purchased a Celestron Astromaster EQ130 telescope and have absolutely no clue about telescopes but would love to learn. I have set this up but cannot even get a decent view of the moon, any ...
2
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1answer
91 views

What percentage of the celestial sphere can the Moon cover?

I was solving a task that said (paraphrasing): What percentage of the night sky can the Moon cover during the entire year, when observed from all points on Earth (what percentage of the night ...
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1answer
91 views

What phenomenon causes “lunar waves”?

In multiple video clips of the moon but also one of Jupiter, some kind of waves can be observed. Is this just the effect of the object moving behind layers of different refractive indexes (similar to ...
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1answer
53 views

What irradiance does the Moon receive during a total lunar eclipse?

As we know, the total solar irradiance normally received by the Moon is about 1361 $W/m^2$ (the same as the top of the Earth's atmosphere). Of course, this changes during lunar eclipses, but the Moon ...
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2answers
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Direction of major axis of moon's orbit

Does the major axis of the moon's orbit point in the same direction (with small deviations) throughout the year? or does it migrate along a path so that after a million years it might be 90° away from ...
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2answers
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Can the Moon eclipse Venus?

The title basically says it all. As seen from the Earth, is it possible for the Moon to eclipse Venus (or any other planet) or are the orbits inclined such that this never happens? If such an eclipse ...
2
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1answer
99 views

How would a flat mirror on the Moon reflect sunlight

I was solving a task that said (paraphrasing): There is a flat mirror on the Moon, whose reflection coefficient is 100%, and observers on the Earth observe it as a star whose apparent magnitude is $...
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1answer
75 views

How big does the moon have to be to have the Earth tidally locked to it

I would like a earth-moon system like Pluto-Charon (but with earth instead of Pluto) where both will be tidally locked to each other within something like a billion years. As the moon would probably ...
5
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1answer
126 views

Lunar orbit distance

Can anyone calculate the distance the moon travels in a single year? I can calculate it as it is close to 2.4 million km, but I need adjustments as the earth is moving and so is the Sun. So, I need ...
5
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1answer
60 views

“Lunar tropics”

The tropics is region of the Earth in which the Sun could be directly overhead. What is the corresponding region for the Moon? Is it the same or slightly larger? I live in the UK and hence have ...
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1answer
69 views

What bright body is next to the Moon in these photos of the ISS transiting the lunar disk?

The question What are the chances that the ISS transits the moon as seen from your house (or headquarters)? links to the SpaceX Instagram-posted photos of the ISS transiting the Moon's disk as seen ...
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0answers
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Computing orbit positions of Jovian Satellites / Moons using JPL data

I've been trying to build a model of the solar system in a game. Thus far I've succeeded in placing each of the planets in position using Keplerian elements and formulae from https://ssd.jpl.nasa.gov/...
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1answer
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Can a solar eclipse be directly overhead?

I have trouble picturing eclipses and whether the moon can be directly overhead.
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1answer
33 views

Recognising lunar month only by looking the sky

Suppose somebody went on an island and don't have sense about time, dates, months. The only thing he has is seeing the sky. Is it possible to recognise which lunar month it is by just looking the sky? ...
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1answer
78 views

Why was the July 27th 2018 lunar eclipse not visible in North America?

I was just wondering if it had anything to do with the fact that last year we were blessed with the opportunity to see the total solar eclipse in our neck of the woods. So this is the universe's way ...
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1answer
103 views

Different full moon face on different places on Earth same time

I have theoretical question. Let's assume that it is full moon and two different humans are looking at it at the same time. One human is for example in London and one in Beijing. It doesn't really ...
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0answers
91 views

What is the highest resolution image of the moon taken from Earth's surface?

According to this article: https://www.theguardian.com/science/2018/jul/26/star-spotted-speeding-near-milky-way-black-hole-for-first-time the Very Large Telescope is "powerful enough to see a tennis ...
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1answer
168 views

Moonless nights?

My husband has told me that there are nights when there is no moon in the sky, because it has risen in the morning and set before dusk. I don’t believe him. Does this happen?
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2answers
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Determine full Moon position into sky from Sun position

Soon a lunar eclipse will take place soon. I'm not sure if I will be able to see the moon during the eclipse (from 9:30 PM to 11:00 PM), because, I have some building, mountains... in my field of ...
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0answers
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Are Saros series separated by “40” in numbering related in any way?

Can anyone help with this question? My question arose from an eclipse related observation that I made while looking into lunar Saros series 129. It is the Saros series number for the lunar eclipse ...
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1answer
40 views

Do celestial bodies actually appear larger along the horizon? [duplicate]

Whether it be the moon (especially when full) or tonight, as Mars is closer than it has been in decades, it appears that these bodies are larger when close to the horizon than overhead. Is this an ...
3
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1answer
49 views

How come moon's difference in thickness between sides does not create an unbalance on its mass?

I've just found out that moon's dark side is 30 miles thicker then the closer side to the Earth. So I'm wondering about moon's mass. How come it's still balanced? Supposing the far side is indeed ...
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1answer
85 views

Changes of the velocity of the Moon due to impacts from other objects?

Has the moon’s velocity changed since ‘shortly’ after it’s formation due to impacts? Wouldn't it be likely that a significant collision would have occurred over such a long period of time? It ...
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5answers
9k views

Why is moon light not the same color as sunlight?

The light from the moon is light being reflected from the sun. The sun, in space, is white. But on Earth, when the light is filtered through an atmosphere, the light appears yellow. So then, why is ...
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2answers
219 views

Why moon sighted only in Kerala but not in rest of India?

I know for most of you the question may look silly, but Kerala is a state in India where the moon (Ramadan moon) will be sighted but not in rest of India. I was reading the news article where I got a ...
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4answers
242 views

Is it practical to build a giant telescope in Moon? (Considering the fact that the atmosphere of moon is very rare)

China's FAST (Five-hundred-meter Aperture Spherical radio Telescope) is the largest radio telescope in the world.(This is huge!!!) As we all know Space Telescopes are better than Earth-Based ...
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1answer
78 views

Solid-body tides on the Moon

There are various good models for solid-body tides on the Earth. Are there any recommendations for tides on the Moon?
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What's the range of days where Solstices/Equinoxes can appear in a lunar calendar?

In ancient lunisolar calendars such as the Hebraic one, the solstices and equinoxes can fall at various dates, sometimes in different months. What's the range of days where solstices/equinoxes can ...