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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5answers
81 views

Am I looking at the moon upside down here in the US?

This may be a very basic question, but I just learned that the moon orbits around the earth counterclockwise. I always thought the earth and the moon shared the rotation and orbit direction. Since the ...
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0answers
95 views

Why does our Moon not have rings?

While our Moon is full of craters, one could consider that these events might have been enough to release amounts of fragmented mass into the Moon's orbit sufficient to establish some sort of ring. ...
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1answer
110 views

Structures on the Far Side of the Moon?

I downloaded an image of the far side of the moon using Google Earth. It is an area to the North West of the Mare Moscoviense (lat 27.3$^{\circ}$ lon 147.9$^{\circ}$) What are the dot-like structures ...
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1answer
507 views

What happens if the Moon moves twice as fast?

If the Moon would rotate around the Earth with double its current speed. What would happen then? Would it get further from the Earth or it would be possible to keep its distance from Earth?
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2answers
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Why does the difference between terrestrial times and universal time, $\Delta T$, have such a strange behaviour?

I was reading about ancient astronomy, and one of the main phenomena described is eclipses. Now, I read this 2016 paper by Stephenson, Morrison and Hohenkerk, in which they determine the values of the ...
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2answers
104 views

When can Moon occult Venus?

I'm trying to solve this task: At what age of the Moon (in days after the new moon) is it possible for the Moon to occult Venus? How I was solving it: Angular velocity of the Moon is 13.2 degrees ...
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2answers
263 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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6answers
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The moon has just the right speed not to crash on the Earth or escape into space. What are the odds?

My understanding is that the moon was created a long time ago when Earth was hit by a big asteroid. The debris then agglomerated into the Moon, which happens to be orbiting at the exact speed required ...
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2answers
119 views

What percentage of the time can we see the moon during the day?

From sun rise to sun set what percentage of the time is the moon visible? I saw one thing at the top of google saying an average of 6 hours a day but that seems like a weird way to answer it. Would ...
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1answer
429 views

What are these faint streaks on the moon?

I was poking around this Gigapan image of the moon's north polar region, when I noticed this area: What is the source of these light streaks? For position reference, here's a zoomed-out shot (I ...
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203 views

Trying to find the source of these three orbital elements

I'm working through section 65 “Calculating the Moon's position” in Practical Astronomy with your Calculator or Spreadsheet (fourth edition) by Duffett-Smith and Zwart. They begin the calculations ...
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1answer
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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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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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3answers
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Can large scientific telescopes observe the Moon without being damaged?

When I look at the full Moon through my 10cm telescope, it is so bright that it hurts. Can large scientific telescopes observe the moon at all? Does that require special protection equipment? Or ...
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1answer
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How can an area be on the day side 90% of the time?

In the magazine "Ciel & Espace", it is stated that crater ridge next to Shackleton crater is an interesting landing site for future missions because it is lit up 90% of the time. I get ...
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1answer
37 views

Is it a partial lunar eclipse or a partial phase of a full lunar eclipse?

I'm trying to solve this task: What is shown in the photo: a partial shadow eclipse of the Moon or a partial phase of a total eclipse of the Moon? I can't really understand it. Could somebody help ...
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150 views

What was the day of the week for the total lunar eclipse (saros 61) that occurred on April 14, 32 AD?

I am interested to know if there is convincing "astronomical" evidence/data to pin down the exact day of the week for the total lunar eclipse of April 14, 32 CE. I am hoping that perhaps ...
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1answer
145 views

What would happen if the Sun, Moon and Earth were isolated?

I am curious to know what would happen to Earth and life on Earth if all other heavenly bodies outside of our Sun, Moon and our planet Earth ceased to exist in some non-destructive way? (this includes ...
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1answer
50 views

When could solar eclipse happen in a way that Sun's disk is diminishing from below?

I'm trying to solve this task: During a solar eclipse, an observer noticed that the diminishment of the Sun's disk began directly from below. Where and when could this be? Concerning "where&...
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1answer
592 views

Could there be an eclipse tomorrow if the Pleiades is covered by the Moon tonight?

I'm trying to solve this task: Suppose today there is a covering of the Pleiades star cluster by the Moon. Could there be an eclipse of the sun tomorrow? The moon? I think the answer to both is no, ...
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3answers
166 views

Why doesn't the Moon fall out of orbit?

If you need to boost ISS to stay in orbit why moon doesn't fall down to earth and KABOOM?
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5k 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
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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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361 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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2answers
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Why does the Moon sometimes look Yellow?

My friend and I both noticed that the Moon looked yellow Yesterday, but it wasn't like that the same time the day before, as far as I remember. Does the Moon sometimes look Yellow? If it does, why ...
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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 ...
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1answer
2k views

How far apart can two people watch the moon simultaneously?

Obviously there's a limited part of earths surface where the moon is visible at any given time. I imagine the area of this surface would be a lot smaller than the area where the sun is visible at any ...
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1answer
95 views

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
64 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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2answers
85 views

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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5answers
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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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3answers
292 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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2answers
118 views

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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140 views

What does the information about the current Moon phase help me as a layperson?

I have just watched an interesting video about Moonphase watch. But why would I need to know about current Moon phase anyway as a layperson? I just can't think of any practical application for the ...
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1answer
88 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
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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 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
38 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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6answers
5k views

Why would the side of the moon that faces earth be as dark as the far side of the moon?

Somebody suggested that the side of the moon that always faces the earth is as dark as the far side of the moon, but is that really the case? Doesn’t earth-shine make the earth-facing side of the moon ...
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2answers
159 views

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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1answer
498 views

Will time that moon crosses meridian always be periodic?

If I observe the moon pass my celestial meridian at a specific north polar clock time will I observe every subsequent passage at ${\rm current\,time} + 13.2^\circ \...
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2answers
773 views

Official Definition of Satellite?

So I had an argument with a friend, which was about whether the Moon is a planet or a satellite. IAU 2006 Resolution B5 gives definitions on what it is to be a planet, but there is a vagueness, as I ...
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2k views

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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2answers
5k views

Is it possible to see a moonrise or moonset twice in a day?

I've been wondering this for quite some time. Due to the variations in tilt from the earth we know that moonrise/moonset times vary. Is it possible that in any location on the earth one might see ...
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1answer
879 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 ...
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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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193 views

Are there pictures from a solar eclipse of the earth taken from a moon landing unit or orbiter?

Did any moon landing vehicle or orbiter took pictures of a solar eclipse happening on the earth, i.e. the moon's shadow on the earth? (Alternatively from other spacecraft showing the whole globe). A ...
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3answers
5k views

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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1answer
137 views

Is the Ordovician meteor event detectable in the lunar cratering record?

Approximately 468 million years ago there were a large number of L-chondrite meteorites falling to Earth. This is called the Ordovician meteor event and was probably the result of a large collision in ...

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