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Questions tagged [the-moon]

Questions regarding Earth's only natural satellite.

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1answer
537 views

Determining sunrise and sunset times based on azimuth and elevation

If I observe the sun and measure the local azimuth and elevation, and I also have my latitude, can I calculate the local sunrise and local sunset times? If so, how would I calculate it? Further, can ...
2
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2answers
3k views

Why can i see the dark side of the moon?

Last weekend (29./30. April) the sky in my area (central europe) was pretty clear and the moon was nicely visible. Funnily, one could not only see the sunlit area of the moon, but also the dark side (*...
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1answer
1k views

Moon and Sun UV Light

How much ultraviolet light comes from the moon at night and from the Sun during the day? I am interested in using a UV camera on a robot to see the UV from the sun/moon to do robot localization.
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0answers
109 views

Angles in Moon, Earth and Sun system

Consider the vector positions of the center of mass of Moon, Sun and Earth, $\vec{r}_{\rm M}$, $\vec{r}_{\rm S}$, $\vec{r}_{\rm E}$, respectively, in a given reference frame. Consider: the angle ...
5
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1answer
151 views

What stabilizes rings or accretion disks?

We think, more or less, that our Moon was formed from an accretion disk caused by a Mars-sized impactor. Cool. Tidal forces can break apart a moon, causing rings. Ashes to ashes, dust to dust: the ...
37
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2answers
9k views

Is it possible to achieve a stable “lunarstationary” orbit around the moon?

Is there a stable geostationary orbit around the moon? My feeling is, that the orbit would collide with earth, because of the moon's slow rotation.
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2answers
307 views

When will the Moon spiral away from Earth? [duplicate]

I am actually doing this for science extra credit. My teacher said that we would die if the moon got too far away. He wants us to figure out when this will happen.
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1answer
186 views

How far away does the Moon have to be until Earth doesn't feel its effects? [closed]

How far in miles does the Moon have to be for the Earth not to feel its effects?
36
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4answers
9k views

Can the moon appear to be in any position in the sky?

It seems to me that the Moon has appeared in many locations - apparent locations - in the 'dome of the sky'. I know that the Sun follows an arc from east to west and that the arc is smaller in winter ...
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4answers
41k views

Can this picture of the moon directly above the sun from the horizon be real?

I recently saw this image, but somebody told me that it is fake, possibly photoshopped. The moon and the sun appear to be on the same perpendicular from the horizon. Is there any way to tell if this ...
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1answer
2k views

Any live moon stream?

I searched Google for a while and of so many available cameras, I couldn't find a moon live stream video camera. Does anyone know any free website that offers this? Where can you see live the moon ...
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1answer
1k views

What is the specific term for time of the night when there is no moon?

There are times when the sun goes down and it takes a while for the moon to rise, because the moon obviously doesn't rise with the sunset whole year. I guess this happens only when the moon is full. ...
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2answers
280 views

Why is the moon phase not in sync with the moon's illuminated fraction?

I am using the following R script to plot the moon phase and the moon's illuminated fraction: ...
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1answer
157 views

Why is the moon's motion more complicated than that of those planets?

I am of course not an expert on astronomy. But from the literature, I have the impression that the lunar motion is very complicated. It seems that Kepler can make sense of the motion of the planets ...
6
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1answer
797 views

Can a bullet be fired on the moon and sent it into orbit?

I know you need oxygen for the ignition, but presumably, if the bullet is impervious (or water-tight) and if there is a little air enclosed in the bullet case, wouldn't that be sufficient to fire it ? ...
3
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1answer
91 views

When will solar eclipses become lunar transits?

When will the moon be far enough away from the Earth that we would no longer consider it a 'solar eclipse', but rather a 'lunar transit' when the moon travels between the Earth and Sun?
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1answer
262 views

Lunar terminator illusion

Sometimes, you can see the Moon high in the night sky, which is illuminated from the side where Sun goes down but slightly from above. It is paradoxical when Sun hangs at the lower level above the ...
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1answer
150 views

What's the closest Venus gets to the moon?

I recently observed the beautiful sight of Venus quite close to the crescent moon, and was wondering, what the closest (angular distance as seen from earth) they come. Are there on-line tables or ...
4
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1answer
304 views

Are these parallel lines I'm seeing in this image a real pattern on the Moon?

In this question I mention the GIF in EarthSky.org's Moon Phases update Lengths of lunar months in 2017. After watching it a while, I've noticed a pattern of parallel nearly vertical lines on the Moon ...
8
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1answer
577 views

If earth changed its orbit, what would happen to the moon?

Let there be an accelerating force acting on earth over an arbitrarily long time to change its orbit around the sun (e.g. by asteroids repeatedly passing by close to earth (intentional or not) or ...
8
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1answer
113 views

What causes the abundance of dust to 'float' in the thin lunar atmosphere?

Several missions to the Moon have revealed a lunar horizon glow, such as the ones seen below by the spacecraft Surveyor 7 in 1968: Image source: NASA According to the NASA article "Model Helps ...
3
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1answer
148 views

Can lunar atmospheric density, as it exists today, increase naturally?

Are there any mechanisms which could increase the density of the moon's atmosphere. The moon's existing atmosphere is exceeding rare, with about 1 000 000 molecules of gas per cubic centimeter at the ...
3
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2answers
67 views

How does the length of the minor semi-axis of the moon's disc's inner terminator vary through the cycle?

The curve that separates the bright and dark parts of the moon's disc as viewed from the earth is called the inner lunar terminator, which is semi-elliptical in shape. We can model the disc as a unit ...
3
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1answer
223 views

Can the Moon provide momentum to an object in Earth's orbit? Gravity Assisted Boost [closed]

Can a satellite maintain an equatorial orbit around Earth near the Moon's orbit to receive partial gravitational boosts by gaining momentum as the satellite passes though the Moon's gravity well? I'...
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2answers
135 views

Non-Newtonian motion of the moon

I watched an interesting excerpt from a BBC show on the work of the McDonald Observatory in its laser measurements of the distance to the moon which are apparently accurate to within a few centimeters....
8
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1answer
142 views

How does the sun move over the year in the sky of the Moon?

Wikipedia's section on the Moon's inclination says it is always 1.5° to the ecliptic. Does that mean that as seen from its surface, over the year the sun at zenith would move 1.5° to the north,...
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1answer
154 views

How can I calculate when the new moon will be observed from a particular meridian?

I have read that Chinese months start on the day on which the new moon is observed from the 120th meridian east. From this I am assuming that the new moon is observable from there each time and that ...
3
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3answers
198 views

Does supermoon's white light splits into seven colours

I took a photo of SuperMoon 2016 and it was very shiny, the light around it showed seven colours. Was it my camera's effect or was it the moonlight's true colours.
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4answers
5k views

Is the moon “perfectly” tidally locked and, if not, how long would it take us to observe it's rotation?

I have a general understanding of how and why a body in space can be tidally locked to it's planet or sun and I'm aware that our moon is in such a state. My question is, if our moon once had a ...
3
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1answer
364 views

How do we know that a natural satellite cannot be a hollow object?

In their 1966 book, Intelligent Life in the Universe, Carl Sagan and Iosif Shklovsky state that "a natural satellite cannot be a hollow object." How do we know this is absolutely true?
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1answer
262 views

How do we get the angular size of a crater without lens?

Suppose I want to calculate the diameter of the crater. I apply the small angle formula $$diameter=\frac{\theta_{diameter}}{206265''}\times D$$ where $\theta_{diameter}$ is the angular size of the ...
3
votes
1answer
237 views

Length of a tidal day or by how much is the Moon late each day?

A tidal day is the MEAN time between successive meridian transits of the Moon. (This is sometimes called called a lunar day, a term that should be deprecated for use in this sense, because it is also ...
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0answers
54 views

How close must a full moon be to become a supermoon?

According to this answer there is a scale of super moons depending on how close the full moon(henceforth anti-sol) is to perigee. So how close to anti-sol does the moon's perigee need to be to be ...
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1answer
139 views

What made the recent supermoon so super?

I understand that a "regular supermoon" is a full moon when the moon is at perigee (closest to earth in its orbit). They seem to happen often, here's a post from one last year. But I've seen news ...
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1answer
284 views

How can the next supermoon be analytically predicted?

The lunar motion can be predicted with basic celestial mechanics, but the perigee and apogee are not always the same, basically because the attraction of the Sun makes some oscilations in the semi-...
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2answers
174 views

What would be the difference in distance between earth and moon on supermoon night (14 November 2016)

As we all know the usual distance between earth and moon is 384,400 km. But i was thinking how much closer it will be on 14 November 2016, as it will be a supermoon, the brightest and biggest moon in ...
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3answers
170 views

Why and how the Moon experiences only slight tidal forces [closed]

I understood the literal meaning of the red-underlined sentences, but frankly speaking, I don't know the processes. I mean I want to know how Earth's rotation makes a cycle of two high and two low ...
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1answer
291 views

Is it possible that Fly a Boeing 777 plane on Moon? [closed]

i always wondered that Is it possible that Fly a Boeing 777 Air Craft on Moon? if cannot how this moon lander's (Apollo) landing in Moon taking off from the moon?
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1answer
536 views

Recurrence of Moon at Virgo's “feet”

A friend of mine saw a video that claimed the moon appears to be at the feet of the constellation Virgo about once every 17 years with its next occurrence being in September 2017. Is there any ...
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1answer
2k views

Will the Earth ever be tidally locked to the Moon?

From my basic understating, Momentum is being transfered from the Earth's rotation to the Moon's orbit by tidal friction. The Earth's rotation slows down and the Moon receedes from the Earth as it ...
2
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1answer
182 views

How to know when the moon is visible on a particular night?

I am looking for beginners information on how I can know when the Moon is going to be visible on a particular night ? Google-fu says to look for moonrise information about my city from websites such ...
4
votes
1answer
226 views

Why does the Moon's terminator look “wrong” in this image?

There is a picture of the moon in National Public Radio's on-line article Get Ready For Halloween By Watching The Moon's 'Occultation' Tonight. It looks wrong to me - specifically, the brightness ...
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0answers
31 views

Faint whitish-blue light around the moon [duplicate]

While i look up at the full moon mostly I see a very faint whitish-blue glow around it.as far the white is concerned I guess that to be because of the lens in our eyes and the white color of moon but ...
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0answers
58 views

The drift of the Moon's equatorial rotation velocity

Are there any citation or documentation showing the measured degradation of the Moon's equatorial rotation velocity (thus affecting its moon's axial rotation)? I am looking for the drift of the Moon'...
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2answers
245 views

From our world's perspective, does the full moon look larger in one city than it does in another?

When I was a very little girl, my dad talked about the HUGE full moon he saw while in the navy. He made the comment during a full moon we were having in Western NYS. He said, this (harvest) moon is ...
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2answers
2k views

When the moon eclipses the sun what direction is darkened first: left or right?

I saw the question and answer for the explanation of the direction of the moon's eclipse from left to right, but what about the direction of the moon as it passes over or between Earth and the sun? ...
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2answers
3k views

Why haven't I seen the Moon?

It has been some time since I've seen the Moon. What are the conditions that might affect whether or not the Moon is visible within a 24-hour period? Please take into consideration any notable ...
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2answers
391 views

How easy would be to see the Moon from Mars?

This question arises from "What planet is better than earth to infer solar system configuration?", where one of the answers pointed that it's easier to discover the Moon from Mars than discovering the ...
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2answers
586 views

Can Earth host another natural satellite than the Moon?

Are there orbits with long-term stability (astronomical time scales) around Earth? Low altitude orbits will decay due to friction with Earth's atmosphere. Inside Earth's Roche limit, a Moon could not ...
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1answer
330 views

The Hollow Moon Story [closed]

I've heard on various programs (yes TV) with "supposed" experts in various fields that there is evidence which would suggest that the moon could be hollow. The experts ranged from scientists, sound/...