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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4
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2answers
317 views

How to resolve the Moon's observed angular velocity with that given by Kepler's Third Law

According to the sidereal period of the Moon's orbit around the Earth of 27.32166 earth days of 86400 seconds we get an angular velocity of $\frac{2\pi}{27.32166×86400} = 2.6617×10^{-6}$. (NASA's ...
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1answer
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Would people on opposite sides of the earth see different details of the moon, if so are there actual photos demonstrating this?

I am aware of phases and the fact that opposite sides will see the moon flipped relative to the other but what I’m asking specifically is would the almost 8000 mile difference between the two ...
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What is the size of the universe? [duplicate]

Will as a result of the continuation of technological progress in the twenty-first century more perfect telescopes or other astronomical instruments that will allow to know what is on the surface of ...
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1answer
58 views

What are the aspects does the moon differs between cities located on the same latitude?

What are the aspects does the moon (astronomical position and other astronomical aspects) differs between cities located in the same latitude? - For example: Seattle, Munich, Vienna, and Ulaanbaator ...
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3answers
253 views

How to find the the diameter of the moon during a total solar eclipse?

I am not able to find the diameter of the moon. I have the following question in my physics textbook: During a total solar eclipse the moon almost entirely covers the sphere of the sun. Write the ...
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Moons with synchronous rotation in our solar system

Are all moons in our solar system rotating synchronously around their planet? If not, what are the criteria that some do and some don't? Many thanks for any insights!
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1answer
81 views

Moon's rotation and revolution

Since the moon's period of rotation around its own axis, and that of its revolution around earth is (almost) same, we always see only one side of moon. This is what was, & is taught in schools. ...
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1answer
36 views

What is Lawrence Krause's theory of total energies?

Does Lawrence Krauss theory say that the total energy in the universe is equal to zero or that the energy in the entire universe remains constant and the mass in the entire universe also remains ...
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Conversion of Moon's Celestial Position (RA and dec) to Horizontal Coordinates [closed]

I'm currently attempting to calculate the equatorial sky position of the Moon for any given Geostatic position (longitude / latitude) for any given datetime. I have tested my altitude and azimuth ...
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Is it a coincidence that on the far side of the moon almost no seas are visible?

Sorry for the maybe too large pictures. They do make the surface structures of both sides of the moon visible though. Is it just a coincidence that on the side facing us is so much sea is visible? It ...
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1answer
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Apparent Magnitude of First quarter Moon [closed]

Given Apparent magnitude of moon is -12.5. Distance of moon and earth is 384400 km. Diameter of Moon is 31 arcmin. Phase of moon is 0.5. Find the apparent magnitude of first quarter moon.
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Is there a precise definition of “Supermoon”?

Elsewhere online I keep reading that a supermoon is the situation when full moon coincides with moon perigee. But see this plot from wikipedia Lunar Distance entry The perigee distance varies wildly ...
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Can we see the south Pole of the Moon standing on North Pole of the Earth

As the Moon's orbit is inclined to Earth's Equator and radius of earth is only 6350Km but Moon is 385000Km away, we should be able to see the south pole of the Moon from below- i.e standing on North ...
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If months are based on the moon, then why are the months longer in the Gregorian calendar than lunation?

What I have always thought / known is that: Days are based on the period of rotation of the earth. Months are based on the moon. Year is the time taken by the earth to make one revolution around the ...
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0answers
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Why does Earth have only one moon? [duplicate]

The moon was first formed billions of years ago when a Mars-sized object crashed into Earth. The pieces formed over time to create our moon. Why was only one moon formed? Could Earth have had other ...
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5answers
980 views

Using parallax to find distance to the moon

I want to use the parallax method (from scratch) to find the distance between the earth and the moon. To get a significant parallax, I need to choose a large baseline. I live in India and my friend in ...
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Moon cycles used for gardening & harvesting

I appreciate that this question may deviate from the standard astronomy questions. I have recently read an article that suggest that gardeners, farmers & winemakers etc sometime use the moon's ...
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2answers
160 views

What did I photograph around 6 AM on April 27th, 2021? Supermoon plus comet?

Facing SW just before sunrise on April 27, 2021 in Central Florida: The timestamps on the pics start at 6:23 end at 6:27. It was still visible and breaking up like a post launch trail that I would ...
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1answer
59 views

What is a “fundamental location”, and why is Mosting A defined as one for the moon?

The crater Mosting A was chosen to be the "fundamental location" for the Moon's coordinate system (latitude and longitude). But what exactly is a "fundamental location"? What does ...
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48 views

What do these coordinates mean: MW - VP101 3° 12' 43.2'' S 5° 12' 39.6'' W?

I have a jacket with a tag that bears the label: MW - VP101 3° 12' 43.2'' S 5° 12' 39.6'' W When I looked it up, I discovered that these are the coordinates of the ...
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Are interstellar meteorites more common on the moon's polar regions?

Given that the rocks of the solar system mostly travel on the disc, is there any considerable probability that impacts on the moon coming straight up and down can be interstellar rocks? If axis-...
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1answer
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Lunisolar calendar: what phase was the moon Y years ago on the spring equinox? [closed]

How would I go around answering these questions (e.g., for $Y=10,000$ -- IOW, historical observations are not available and the time is too long ago to rely on a fixed calendar): How many days ago ($...
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1answer
46 views

Lunar Inclination

Are there published tables for Lunar Inclination? I am interested because I believe this determines the degree of "Diurnal Inequality" of tides. There are tons of publishes tables of tides ...
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Waxing crescent moon [duplicate]

Would like to understand the visibility of the moon from an astronomical point of view of view. Is it possible for a waxing crescent moon to be visible in some countries while not being present in ...
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1answer
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Is it easier to see the young moon when it's closer to the sun?

With the naked eye, would it be easier to see the moon when it's close to the sun, because it might reflect some more light (or not, I'm not sure) or farther from the sun because the sun shines ...
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1answer
177 views

Why temperature of dark side of moon is not 3 Kelvin

The temperature of the space between Earth and the Moon is around 3 Kelvin ($\approx -270^\circ {\rm C}$). The moon has no atmosphere, therefore the heat convection is not possible from the bright ...
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1answer
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How big and how far away would the moon be if earth was the size of Jupiter?

If the earth were the size of Jupiter, what would its 'moon' be in both relative size and distance? I did some quick figuring and think I roughly figured out that if placed at the position of the sun, ...
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1answer
55 views

Has lunar opposition surge ever been observed from Earth? From Earth orbit?

This thorough answer to How long does lunar opposition surge last? Are there measurements of the full Moon getting suddenly brighter? details observations of lunar opposition surge by the Clementine ...
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1answer
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How long does lunar opposition surge last? Are there measurements of the full Moon getting suddenly brighter?

Wikipedia's opposition surge is a short article and forwards shadow hiding and coherent backscattering as proposed mechanisms, but it doesn't really explain how much the brightness of the Moon ...
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3answers
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How to determine when Sun/Moon is aligned to two location on Earth's surface?

I would like to make a photo to Moon/Sun when it is very low on horizon, so if I make the shot far away from an object on Earth surface, it appears as big as the Sun. But how can I calculate the right ...
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1answer
287 views

Where is the Moon for the last five or six days? [duplicate]

The date today is March 18th 2021 Thursday it's 6:00 p.m. I'm in the area of Sarasota-Bradenton Florida. I haven't seen the moon and it's been clear skies for roughly the last five or six nights... I ...
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1answer
260 views

If Planet Nine indeed exists, how large a impact event there should be to be seen from Earth?

Recently I've found this news article, A meteorite crashed into the Moon during total lunar eclipse in January, about a collision into the moon that happened while a lunar eclipse was under way. ...
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3answers
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Why can I see sometimes a horizontal half moon instead of a vertical one?

Why do I sometimes see a horizontal half moon, instead of the more usual vertical one? I keep getting answers for crescent moons, but this is a half moon with its curve closer to the horizon, like a ...
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2answers
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Absolute model ages of lunar craters

I have been looking at several articles on the dating methods of craters, but I am wondering how exactly the "absoluteness" creeps into it. I came across several methods that link crater &...
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1answer
156 views

This article says the moon may start moving closer to the Earth in the distant future; could this be true?

Bruce Dorminey wrote an article for Forbes with the title of "Earth And Moon May Be On Long-Term Collision Course". The article notes: "For now, our anomalously large Moon is spinning ...
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2answers
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What exactly was the Moon's “Evection Resonance”?

Ward et. al define the evection resonance of the Moon with the Earth and Sun as: occurring when the lunar perigee precession period equals one year. Does this simply mean that the angle formed by ...
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How can lunar pits be distinguished from craters?

ESA's news En route to exploring lunar caves features the following paragraph: The Moon's surface is covered by millions of craters, but it also hosts hundreds of very steep-walled holes known as ...
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2answers
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Elongated Moon crater statistics?

Many craters on Moon have circular shape as a result of the explosion upon impact. I got interested in oblong craters created by impacts striking the surface at a very low angle. Is there any ...
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2answers
128 views

Do the earth and the moon reflect the different fractions of total solar radiation proportionally?

Reading on this website that: "All of the energy from the Sun that reaches the Earth arrives as solar radiation". "Solar radiation includes visible light, ultraviolet light, infrared, ...
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1answer
97 views

How can the author of this article conclude that earth-shine on the moon is 100 times brighter than moon-shine on earth? [duplicate]

I don't understand the reasoning of the author of this article, on page 26. How can he conclude that full earth-shine on the moon is 100 times brighter than full moon-shine on earth?
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Accelerations on the Moon due to its orbit and its spin

A gyroscope is placed on the equator of the Moon. It detects among others 2 accelerations: one due to the orbit and one due to the spin. What is the module of the second one compared to the first one? ...
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2answers
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Which unit is most suitable in comparing needed light intensity for night reading on the Moon, vs on Earth?

Which unit is best to use, and why, when determining how many times easier it is to read a newspaper (or any other printed text) on the moons surface at night under a full earth, compared with reading ...
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2answers
152 views

Solar wind, Earth wind and planetary winds?

In February 2021, a new form of "electrified gas breeze" was announced, see blog by Tony Phillips entitled A New Form of Space Weather: Earth Wind which might a possible explanation for ...
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1answer
139 views

Scholarly work on the gravitational disruption of a rocky planet by a close pass with another planet?

note: While the apparently abandoned question Effects of a rogue planet passing between the Earth and the Moon? (inspired by Thundarr the Barbarian) asks for speculation and was answered with it, this ...
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Did the Moon have a substantial atmosphere in the past?

The layer of gas surrounding the Moon is very thin. It is a surface bound exosphere, where particle-particle collisions are rare. In the past, the Moon was more geologically active, with eruptions ...
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What replenishes the lunar atmosphere?

It is often said that the Moon doesn't have an atmosphere. But there is an envelope of gas surrounding the Moon, albeit a thin one, so the Moon has at least an exosphere. The Moon doesn't have its own ...
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0answers
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Can we see traces of exo-moon formation?

Our Moon was likely formed by the collision of a Mars-size object with the Earth soon after the planets first formed. Would traces of such an event be detectable by observing the protoplanetary disc ...
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2answers
5k views

Is oxygen really the most abundant element on the surface of the Moon?

I found this infographic that seems to say that oxygen is the most abundant element on the surface of the Moon. Is this really the case? If so, under what form is this oxygen?
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2answers
678 views

Does lack of atmosphere on the moon make earth-shine more, or less, bright?

The earth acts like a light-globe in the sky for half of the moon, the side that is facing the earth. In what way does lack of moon atmosphere influence earth-shine. Does it make earth-albedo brighter,...

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