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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6
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2answers
64 views

What's the difference between a crater and a basin?

When I was searching the name of the Moon's largest crater, many websites said that it was the South Pole-Aitken Basin. But in some definitions I've found, the word "crater" is used to ...
0
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1answer
23 views

How can I find a date when the moon at zenith over a specific spot on the equator?

I would like to know when the moon is directly overhead 0° S, 166° E. Are there any websites that will show me any of those dates?
2
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1answer
43 views

What are “p” and “r” wrt the moon?

Still learning, thinking - and failing - about the moon. timeanddate.com has this cute and dynamic moon sketch at e.g. https://www.timeanddate.com/moon/uk/london They generate this based on three ...
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0answers
28 views

How do I calculate the elevation angle to the horizon?

I'm creating an app to visualize the southern area of the moon from a first-person perspective. I'm trying to determine if a point on the surface is a "checkpoint," where the elevation angle ...
2
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1answer
34 views

Should the synodic period or the orbital period be used to determine the diameter of the Moon?

Aristarchus famously used a lunar eclipse to determine the diameter and the distance of the Moon, given that a lunar eclipse can last up to 3 hours and the angular diameter of the Moon is 0.5°. Using ...
0
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1answer
62 views

Does the Honey moon have a precession problem?

In Steven Colbert's interview with Neil deGrasse Tyson after about 03:16 the following is explained: But wait, all the moons - all the full moons of the year have ...
0
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1answer
88 views

Could it have been possible for the Moon to be split without any observable effect on Earth?

Before asking my question, I'd like to clarify why I'm asking about something so absurd. A supersitious claim has been bought to me that in the past, the moon was split and seperated as a sign. My ...
2
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0answers
30 views

Which is a better way to increase magnification - by choosing an eyepiece of lesser focal length or by choosing a telescope with higher focal length? [duplicate]

Magnification of a telescope = (focal length of telescope / focal length of the eyepiece being used) $$M=\frac{f_{objective}}{f_{eyepiece}}$$ If I want 75 X magnification and the following are the two ...
2
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1answer
50 views

Does tidal locking also slowly reduce the orbiting body's axial angle?

The Moon is tidally locked to the Earth, and it has an axial angle of 6.687 degrees relative to its orbital plane. I'd like to know: did the Moon start out with a higher axial angle? In other words, ...
2
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2answers
63 views

Does the Sun and Moon basically appear to “move on the sky” identically regardless of location and date?

For a long time, I've been trying to use Stellarium (simulation) and many visualizations and animations in order to get a good idea of how the Sun and Moon move across the sky, as seen by a human from ...
9
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3answers
2k views

What orbital period would produce one New Moon (and one Full Moon) each year? What other effects would this produce?

I am interested to know whether it's possible for the moon to orbit the earth at such a rate that we would see only one New Moon and one Full Moon a year. If so, what other effects would we experience?...
2
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1answer
55 views

How many days a month can you see a moonrise during daylight?

For about 15 days before a Full Moon the moon rises during the day, and for about 15 days after a Full Moon the moon sets during the day. I think it might be possible at full moon for the moon to rise ...
1
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2answers
104 views

Powerful-enough telescopes to observe the Lunar Roving Vehicle from Earth?

Apparently, not even the Hubble telescope (which is actually in orbit, not even on Earth) is powerful enough to observe the LVR... will we ever have the technology to observe the LVR from Earth? (it ...
0
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0answers
18 views

When was the variation of apparent diameter of the moon first measured?

The orbit of the Moon around the Earth isn't quite a circle. Since distance between the Earth and the Moon changes over time, the apparent diameter of the Moon also varies very slightly. With a ...
3
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1answer
79 views

How to calculate the moon's illuminated fraction tilt?

I use "Astronomical algorithms" book by Jean Meeus for programming algorithms for the moon data calculations. I've already created a lot of methods but stuck on the calculation of the moon's ...
2
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3answers
71 views

Measuring parallax angle, same local time or the same time

I was thinking about measure the distance to the moon using parallax angle. But I have a confusion. I have read couple of articles about that, but one thing is unclear. Should we take pictures of moon ...
1
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2answers
64 views

Considering that the moon’s gravitational pull on earth is so weak- we need special instruments to detect it- how does it cause the tides?

That the moon’s gravitational pull is responsible for the tides is established. However, if we want to detect the moon’s gravitational pull on earth, this is very challenging. This seems to be a ...
2
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1answer
71 views

How high were the tides back when the Moon was much closer to Earth?

In this article it is stated that the Moon was originally much closer to Earth at a distance of 22,500 km rather than the 384,400 km it is today. What was the height of the tides back then in meters? ...
0
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1answer
47 views

How accurate is Stellarium at depicting the Earth, from the Moon, approaching a solar eclipse (from Lunar perspective)?

This is how Stellarium depicts the positions of the Earth and Sun 24 hours before the solar eclipse (from Lunar perspective) on Jan. 13, 2131 A close up of the Earth on that day (Jan 12) shows no ...
3
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2answers
87 views

Small changes to Earth's orbit caused by a large impact on the Moon

Is there any scenario where a large impactor striking the far side of the Moon would perturb the Earth's orbit enough to reduce the distance from the Earth to the Sun and still remain within the ...
1
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1answer
75 views

Why does time pass faster in moon than the earth?

One of my friends said that, time passes faster in moon than the earth Why does time pass faster on the moon than on the earth?
6
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1answer
297 views

How to search SIMBAD using identifiers?

I'm trying to get some data about the moon from SIMBAD (specifically, radiation spectrum in certain wavelengths), and I encountered an unexpected problem: I can't find the Moon. In SIMBAD, I can ...
2
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2answers
55 views

Celestron Nexstar 102GT

Good day folks. My Grandson would like to start using this Telescope Celestron Nexstar GT102, has been in the basement for years, and unfortunately, we appear to have misplaced the eyepieces. Just ...
1
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1answer
43 views

Why does the moon looks like having different filters sometimes?

Why does the moon look more yellow or more LED-like? Thanks in advance
9
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1answer
139 views

How did the Archimedes crater fill with lava?

This is the Archimedes crater, on the moon, near the Apollo 15 landing site. It is located in Mare Imbrium, a plain filled with lava. The strange thing is that the interior of the crater looks flat, ...
5
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3answers
189 views

can moon rise before sun and set after it in the same day

I found it mentioned in ancient Arabic astronomic book Kitāb al-Amwāl by Ibn Qutaybah (889 AD) Cresent can't be seen in the morning in the east in front of the sun and in the evening i the west ...
3
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0answers
65 views

How much (more or less) of the moon will be visible as it recedes from the Earth?

The Moon is receding from the Earth, at a rate of about 4 cm per year. We can currently see about 59% of the Moon's surface, from the Earth's surface. Will the amount of the Moon's surface we can see ...
1
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2answers
87 views

Timekeeping on other celestial bodies than Earth

I have looked for months for any site capable of calculating solar altitude w.r.t an observer located on the surface of a generic celestial bodies, but with no luck as of now. Even NASA does not ...
1
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1answer
49 views

Angular diameter result confirmation

Not being a math-minded person at all, however basic it might appear to be to all of you in this particular question, I would like to get the following calculation confirmed. I'm trying to calculate ...
24
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3answers
3k views

Is it possible to completely see the edge of a half moon at night?

Some days ago, about 1 ~ 1.5 hours after the sunset I could see a very bright half moon, and the interesting part is, I think I could see the edge of the dark half of the moon, i.e. a whole circle, ...
4
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1answer
81 views

How does using Tidal energy affect the moon?

Reading another question Where do we have it from that the Moon is migrating away from Earth? I makes me ask what effect does harvesting tidal energy for electricity production have on the rate the ...
2
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0answers
45 views

Can tidal locking increase rotational kinetic energy? Where does the energy come from then? [closed]

I was thinking about the explanation for how the Moon gets tidally locked with the Earth. We are working in the non-rotating reference frame of the Earth, and assume it is inertial (to an approximate ...
1
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1answer
252 views

Sunrise and Moonrise time are same [duplicate]

I checked an app and saw that today, the sunrise and moonrise time are almost same. The sunset and moonset time are also same. Why does this happen? I have always known that moon rises at night and ...
-4
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2answers
137 views

Why is the Moon's volume so small compared to the Earth's?

The Moon has 27.3% of the Earth's radius/diameter but only 2% of the Earth's volume. I don't quite get it why the Moon's volume is that small despite having more than a quarter the 2-dimensional size ...
4
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2answers
61 views

Is there an advantage to the equatorial region of the far side of the moon for a radio telescope or would any crater on the far side work?

If nearly any crater on the far side of the moon will work, and not just equatorial craters, then we could pick craters near the possible future Artemis base at the South pole which would allow easier ...
27
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2answers
9k views

Where do we have it from that the Moon is migrating away from Earth?

I know Neil Armstrong placed a mirror on the Moon and people shoot lasers there which get reflected, by this, measuring the time the light is needing, they can conclude the current distance of the ...
2
votes
2answers
147 views

How can the Earth and the Moon be in synchronous rotation if the Moon won't be in geostationary orbit?

It is said that the Moon moves away from Earth and that during the Sun's red giant or white dwarf phase the Moon will be about 40% farther than now and in a synchronous rotation ("hantle rotation&...
3
votes
1answer
54 views

How did DSCOVR capture the Moon's shadow on Earth during the August 21 2017 solar eclipse without the Moon itself also being visible?

In this gif you can clearly see the Moon's shadow moving from the West Coast of the U.S. towards the East Coast during the August 21 2017 eclipse. DSCOVR (the satellite that imaged this) is located at ...
5
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2answers
3k views

How to explain this trajectory of the moon taken from the same spot on Earth over 28 days?

Found this picture online, was wondering why the trajectory has taken such a beautiful shape ?
4
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1answer
119 views

Isn't it absurdly unlikely that our Moon would constantly be “facing” us? [duplicate]

I never thought about this until recently, but our Moon is constantly rotating in such a way that it happens to perfectly be "looking at us" at all times. That sounds incredibly unlikely to ...
2
votes
1answer
41 views

What are the Kinematics / Dynamics behind the motion?

https://www.timeanddate.com/eclipse/in/@8133395?iso=20200621 The link I have attached is a predicted model for the eclipse in my area! I am very much confused about the movement of the moon analogous ...
2
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0answers
44 views

Keplerian Elements for the Moon and Earth around their Barycenter

So I'm looking to replicate the inner Solar System to a decent degree of accuracy. So far I've been utilizing the Keplerian Elements and Equations for the planets, as shown here. There is one issue ...
22
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3answers
5k views

Why is the Moon's orbit so complicated?

I like to think I have a good enough understanding of astrophysics but there's still one thing that I just can't explain. Why does the Moon orbit the Earth the way it does? Many other moons in the ...
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0answers
95 views

Best response to shut down the fake Moon landing conspiracy [closed]

This Question was closed for various reasons. For people looking for the answer to similar question, please see this link. I believe this is a solid answer to my question. As the designated Space ...
5
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3answers
1k views

Why doesn't the moon always follow the same path? Or why aren't the moon's apoapsis and periapsis fixed?

I have seen many times that the moon doesn't follow the same path. Sometimes the moon gets very close to earth which is shown in the news. If the periapsis of the moon is soo close then why doesn't a ...
3
votes
1answer
133 views

Historical lunar occultation of Venus seen from Sicily in the winter?

I am looking for dates in history, from 400 years ago or older, when there was an occultation of Venus by the Moon during Winter as seen from Sicily. Venus was rising, and according to the text that ...
1
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0answers
32 views

Ladakh India where the moon (Ramadan moon) is sighted but not in rest of India [duplicate]

Today 22 May 2020 around 3 p.m Ladakh India sighted new moon(Ramadan moon) but not in rest of India.I read many articles acc. To them it is not visible today, then how it was seen from Ladakh... .
53
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5answers
5k views

Why does Io cast a hard shadow on Jupiter, but the Moon casts a soft shadow on Earth?

Io (source): The Moon (source):
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2answers
72 views

First visibility of the moon

I am new here, and hope to state the question well. In Islam, it's known that the Lunar Month starts if the Moon is sighted after the sunset of the 29th day of that month. If someone claimed that ...
4
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0answers
56 views

How will the Solar tides affect the Earth's rotation once it is tidally locked to the Moon?

It is my understanding that the tidal forces of the Moon acting on Earth cause it to slow down its rotation and, because angular momentum is conserved, the Moon's orbit subsequently expands. This ...

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