Questions tagged [the-moon]

Questions regarding Earth's only natural satellite. For questions about the natural satellites of other planets, use the tag [natural-satellite].

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3answers
924 views

Trying to categorize moon phase using fraction illuminated

I have a dataset with events that are occurring over a period of 5 years. I am trying to determine whether these events are related to moon phase. I downloaded the "fraction of moon illuminated" for ...
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1answer
2k views

Is this photocomposition of Andromeda's galaxy and the Moon accurate?

I recently saw the below image circulating around twitter/facebook/reddit. It is titled "Andromeda's actual size if it was brighter" One of the comments provides a link to another comparison provided ...
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1answer
177 views

spin–orbit resonance, between moon and the earth

if this happens in the future what will be the consecuences of this?. Consecuences for the life or the climate conditions.
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2answers
166 views

Moon trip in 1969 and temperature [closed]

The USA claims to have traveled to the moon in 1969. BUT... The temperature on the moon at day is 100 C and at night is -173 cold. How did the astronauts not die?? How did they survive?
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2answers
215 views

A [very basic?] question about light scattering and colors

Since the night two days ago, the moon here in Israel appears to be orange as it rises, and then gradually becomes white as it continues travelling across the sky. This phenomenon comes in a great ...
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2answers
477 views

Why the moon is blinding me right now?

I'm on the most northern part of Germany (Schleswig-Holstein) it is 11.20pm right now and the moon is here as bright as I never saw it before I was just outside and it is as bright as if it was dim ...
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1answer
213 views

Is there a term for a horizontal moon crescent

I seen the other day the moon lit directly below or towards my horizon perfectly. My question, is there a term for when a moon's crescent is aligned with the viewer's horizon?
6
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0answers
200 views

When the Moon formed and early on, did it orbit over the Earth's equator?

Or was it always at about 5.14 degrees inclination or has the inclination changed over time? See diagram. James K's answer to this question got me thinking about this, and I don't mean to call him ...
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1answer
352 views

View of moon from South Pole?

What would the moon look like to someone at the South Pole? To a first approximation, it's bisected by the horizon. But how far above and below does it get?
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1answer
2k views

Can the moon turn red even without an eclipse?

My friend posted a picture of the moon as if there was an eclipse because it was so red but there wasn't a scheduled eclipse at the time (it was last night, from the Philippines). I'm a little ...
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2answers
323 views

Mountains on the moon during solar eclipse?

I ask myself the reason of why the sun in not uniform on the edge of the moon at this moment of the eclipse (cf. picture) is not unifom is because of the mountains of the moon ? Or can it due to ...
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0answers
68 views

Why weren't Lunar meteorites identified until 1982?

According to Wikipedia the first meteorite of Lunar origin wasn't identified until 1982. Today 306 Lunar meteorites have been identified. Why weren't they identified as Lunar already a decade earlier,...
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1answer
958 views

What would be the required conditions for a lunar eclipse to occur only once on a precise annual basis?

As I am aware, lunar eclipses can take place several times a year on Earth. However, I am curious whether it would be possible for this event to only occur once annually on a specific date (and ...
6
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1answer
435 views

Why did the moon have a distinct reddish edge tonight?

In Monterey, California, with a "half-moon" high in the sky at about 9 pm (2017-08-30), the moon had a distinct red outline on the outer edge of the NE quadrant; for awhile I saw it also on the outer ...
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2answers
402 views

Estimating the Rate at which Moon is Moving Away from the Earth

Here it has been discussed why the moon is moving away from earth at a rate of 1.5 inches per year. Is there any way we can estimate the value (e.g, 1.5 inches per year) mathematically?
35
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3answers
644 views

If you lived on the far side of the Moon, how could you infer the existence of Earth?

Suppose that you deposit an astronomer, armed with our current knowledge of orbital mechanics, on a dome on the far side of the Moon, so that the Earth is perpetually hidden from them. (And, of ...
5
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3answers
464 views

Does the Giant Impact Hypothesis explain how the Moon circularized its orbit?

I just read most of Wikipedia's article on the Giant Impact Hypothesis. Basically a large object impacts Earth and creates debris that soon coalesces into the Moon. But there is something I did not ...
4
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1answer
143 views

Why do some solar eclipses' umbra cross arctic/antarctic regions?

The ecliptic (Earth's orbital plane) is inclined 23.4 degrees. This is the same as Earth's axial tilt. The Moon's orbit is inclined 5.145 degrees to the ecliptic. Therefore, the maximum latitude ...
4
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1answer
133 views

How much of the sun needs to be blocked in order to see a noticeable drop in brightness

I live in NYC and just experienced the eclipse. What fascinated me the most was that despite the fact that the sun was about 70% blocked, the area was not noticeably dimmer. If the news wasn't saying ...
2
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0answers
60 views

Does Earth illuminate the unlit part of the Moon as [duplicate]

... today is August the 17th? I just saw the moon (4:30 CEST) and I have the strong impression that the unlit (by the Sun) part of the Moon is anyway "visible" as a very very dark grey portion. It ...
4
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1answer
461 views

Why is the Moon smooth near the equator and bumpy near the poles?

It looks as if it was polished by applying emery to its spinning equator. My initial guess was that it was simply an illusion caused by light direction, but the terrain map shows the same phenomena. ...
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1answer
490 views

Converting Earth Moon Barycenter coordinate to Geocentric coordinate

I have Earth Moon Barycenter coordinate (J2000) generated from VSOP2013 in Astronomical Units, ...
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1answer
372 views

Moon, center of mass & geometric center, tidal locking

Since the moon is tidally locked to earth, what about center of mass and geometric center? How far from each other are they? Can a celestial body be tidally locked to an other one if its mass ...
6
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1answer
311 views

The most feasible hypothesis about Theia

The formation of the Moon had many hypothesis over the years, most of them involving a Mars-sized body called Theia, which presumably collided with the Earth. But even within the Theia hypothesis, is ...
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2answers
904 views

Does the light from a torch reach to the moon?

If a torch is switched on and pointed towards the moon, would the light from the torch reach to the moon?
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1answer
596 views

How much the moon movement can influence an equatorial mount setup?

If I use an equatorial mount for my telescope to view the moon, is there a way to take in count the moon movement around the earth, or the movement is too small compared to earth rotation?
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1answer
374 views

Nodes and declinations of Moon

This nice page from NASA has the possibility to create an astronomical events calendar for a certain period. I tried to do that for the year 2017 for Central Europe. What comes out puzzles me: On ...
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2answers
2k views

Why do certain moons have their rotational period equal to their orbital period?

Our moon and Saturn's moon, Titan, have this feature. Because of this we only observe one side (hemispere) of our moon. Why is this? What is the Newtonian or astrophysics that would explain this? ...
3
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1answer
137 views

is there any mathematical formula, paper or anything that shows the probability of a meteor hitting a particular spot of moon's surface?

According to this article http://news.nationalgeographic.com/2016/02/160209-meteorite-death-india-probability-odds/ a science professor at Tulane University made a paper to calculate the probability ...
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1answer
167 views

Meteor shower from Moon's “debris”

Did we ever witness a "meteor shower" which was actually dust or debris of some kind from our own Moon?
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2answers
174 views

Is there a timekeeping word for the orbit of a moon?

For a planet, we can colloquially refer to its period of rotation as a "day" and its period of revolution around its parent star as a "year." Some worlds have unique terms, such as Martian days being ...
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3answers
105 views

What of the following moon-situations would be better?

Okay, so imagine that there is an Earth-like planet, with the following conditions: It's further from it's sun than the Earth is from the Sun (not much, but enough for weather to be a little colder ...
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1answer
139 views

Does the Earth ever cross the Moon's path with respect to the CMB?

Title says it, really. As I understand, our total peculiar motion with respect to the CMB is 631 (+/-20) km/h, in the direction of 10.5h RA; -24 deg Dec (or rather away from 22.5h RA; +24 deg Dec, ...
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1answer
1k views

Does the new moon appear at the same time around the world or in one region last [duplicate]

My query is basically, say for example if the new moon is seen in the Middle east region, does it mean that it was the day of new moon in sub continental country as well ? You can't have a new moon in ...
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1answer
1k views

How big would the Earth look from the Moon?

Imagine standing (somewhere) on the Moon's surface. How big would the Earth look from the Moon, compared to the image of the Moon we see from Earth? What would be the ratio between the diameters of ...
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1answer
91 views

In this image, where would the antumbra be?

In this image where would the antumbra be?:
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1answer
643 views

How moon north/south nodes can be calculated

If the planetary geocentric position of the moon is known (say, longitude "254°31'35"") is it possible to calculate such position for north/south (ascending/descending) moon nodes? Or what else needs ...
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1answer
872 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 ...
5
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3answers
6k 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
2k 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
163 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
210 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 ...
40
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2answers
14k 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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1answer
242 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?
38
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4answers
12k 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 ...
16
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4answers
45k 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 ...
2
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1answer
3k 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
3k 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
386 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: ...
4
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1answer
200 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 ...

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