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].

Filter by
Sorted by
Tagged with
1
vote
1answer
127 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 ...
5
votes
2answers
915 views

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 ...
3
votes
0answers
55 views

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 ...
1
vote
1answer
42 views

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 ...
2
votes
2answers
120 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, ...
-1
votes
0answers
67 views

Huygen lander short life [closed]

The short lander life is attributed to Titan’s conditions. Which of those conditions are the ones that most likely impacted the lander?
0
votes
1answer
95 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?
0
votes
0answers
24 views

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? ...
1
vote
2answers
43 views

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 ...
5
votes
2answers
117 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 ...
2
votes
1answer
103 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 ...
3
votes
0answers
34 views

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 ...
1
vote
0answers
27 views

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 ...
0
votes
0answers
26 views

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 ...
32
votes
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?
7
votes
2answers
659 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,...
0
votes
1answer
37 views

What is the degree of reflection of light from sun to the moon? [closed]

As Moon reflects the light from the sun it must have an ANGLE OF INCIDENCE and ANGLE OF REFLECTION... What Is the angle of reflection then?
16
votes
1answer
3k views

How many times brighter would full-earth-shine appear to people standing on the moon, than full-moon-shine does to people on earth?

The definition of brightness, according to Wikipedia: the term brightness in astronomy is generally used to refer to an object's apparent brightness: that is, how bright an object appears to an ...
15
votes
5answers
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 ...
5
votes
2answers
78 views

When was the last eruption on the Moon?

The lunar mare are basins that filled up with magma over the course of the Moon's history. So there were eruptions on the surface of the Moon at some point in time. When did the last eruption happen ...
1
vote
0answers
42 views

Moon's and nodes' inclination to the Invariable plane

Moon is inclined to the ecliptic 5.14 degrees. Earth's inclination to the invariable plane is 1.57869 degrees. What is the Moon's, and node's inclination to the invariable plane? Since the Moon has an ...
-1
votes
2answers
93 views

Sunset moonrise what happens in between?

Here in south London I have just seen that the sun will set at 16:45 hrs but the moonrise does not happen until 2hrs later 18:45 hrs what is happening in this two hour void, will it be too dark to see?...
27
votes
6answers
9k views

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 ...
3
votes
1answer
71 views

On a lunar map, why is it labelled East on Earth, West on Moon?

source Why is east and west reversed for the moon? Why does north and south remain the same? Please explain like I'm five.
1
vote
2answers
164 views

How to calculate the period of a lunar mansion?

What is the period of a lunar mansion or station referring to and how is it calculated? Wikipedia says the following: A lunar station, also called a lunar mansion or lunar house, is a segment of the ...
3
votes
1answer
93 views

Exact ecliptic position of Earth and Moon from Mars as photographed by Curiosity Rover?

I've been studying the idea of travelling through space and navigation - in particular: Apollo sextant (used by astronauts to plot the position of their spacecraft relative to stars). And, in order to ...
3
votes
1answer
30 views

How to find the moons maximum culmination at a location

Forgive me if my terminology is incorrect, but is there someway or somewhere when I can calculate based on my location when the moon will be at the highest point in the sky overhead based on my ...
2
votes
2answers
127 views

How does one go about submitting a name for a newly-discovered lunar crater?

Suppose I discover an uncatalogued crater on the lunar surface, and decide to name it. How would I submit my proposed name to the IAU?
0
votes
0answers
38 views

How does one go about naming a lunar crater? [duplicate]

Suppose I discover an uncatalogued crater on the lunar surface, and decide to name it. How would I submit my proposed name to the IAU?
8
votes
2answers
806 views

Where are Moon's Apogee and Perigee? Do they rotate too?

Where are Moon's Apogee and Perigee? Which one is inside, towards the Sun, between Sun and earth? Do they rotate too just like the north, south node? Does Moon always need to be on Apogee/Perigee ...
10
votes
1answer
521 views

Why does the angular size of the Moon change?

I know that the orbit of the moon is elliptical. But I cannot understand this graph: The number of 'bumps' in the graph is around 13~14 in a year, so I concluded that the each 'bump' indicates one ...
1
vote
2answers
99 views

A plot of the Moon-rise/sets on the Horizon Location

We have been trying to see where the moon rises/sets on the horizon. Unfortunately, the moon is not cooperating. Even when we know the moon rise/set times (timeanddate.com), we often cannot find ...
1
vote
0answers
52 views

Meteor size and frequency distribution for Earth vs. moon or other planets?

I struggle to find an answer to the at-first-sight simple question if or how the size distribution and frequency distribution of incoming rocks hitting the ground or the atmosphere vary from Earth, to ...
1
vote
2answers
71 views

North node, South node correct understanding

What is the correct concept of the North node and South node? There is some conflicting information on the internet. Which one of these two is correct? 1. Sourced from some Astrology material - How ...
3
votes
2answers
56 views

Does a lunar occultation of Mars happen twice a year?

The Space Exploration SE question When our Moon is hiding Mars, is it possible to create a radio communication between Earth and Mars? links to this short article in the popular press Mars is hiding ...
4
votes
1answer
129 views

Moons with curlicue paths around our Sun?

I naively believed that since our Moon orbits Earth, and since Earth orbits the Sun, the path our Moon might take around the Sun would be this type of epitrochoid curve: I was surprised and delighted ...
4
votes
1answer
94 views

Why isn't the moon's surface made of mini craters?

I thought that the millions of mini rocks that hit the moon would cause it to be entirely cratered and not flat. Why is the moon not like this: why aren't craters visible in the footprint photo?
3
votes
1answer
45 views

Determining the percentage area of the moon's disk shaded with respect to time

I've looked online and I've found sources such as this paper on a lunar phase simulator as well as this article about lunar phases. I'd like to be able to model the area of the lunar disk which is ...
3
votes
2answers
321 views

How to map moon phase number + “lunation” to moon phase name?

I am querying an API (weatherbit) which returns a moon phase number which looks like this: 0.9594168 For the 16 days I look at the numbers vary from 0.006 to 0.99. I have 8 "moon phase" ...
12
votes
1answer
200 views

Has the Earth-facing side of the Moon that we see today always faced us ever since the Moon got tidally locked? Or does it precess?

Title. Does the Earth-facing side of the Moon slowly precess due to perturbations and torques exerted by other bodies? Or is the side of the Moon we see today the same as when it first got tidally ...
4
votes
1answer
84 views

What is the duration of the era during which it will be possible to perceive a total solar eclipse?

Total solar eclipses occur because the Moon and the Sun have the same apparent size in Earth's sky — the Sun is about 400 times wider than the Moon, but the Moon is about 400 times closer. It's my ...
2
votes
1answer
83 views

How long was a lunar month in ancient times?

As the Moon is getting farther and farther from Earth, it's natural that the time it takes to circle around our planet is going to increase, thus the month will be longer. However, I read that the ...
13
votes
8answers
10k views

Do our sun and moon have names?

We seem to have named every moon orbiting other planets. Why haven't we named our own moon? And for that matter, why doesn't our sun have a name since we name or number stars?
2
votes
0answers
24 views

How to I calcuate observed position of the Sun and Moon using the SOFA C library?

There are a number of answers on here that skirt the topic, but no concrete answers. I currently have an implementation based on "Astronomical Algorithms by Jean Meeus" for stars, moon, and ...
-1
votes
1answer
123 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?
6
votes
2answers
85 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 ...
1
vote
1answer
34 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
votes
1answer
48 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 ...
0
votes
0answers
35 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
votes
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 ...

1
2 3 4 5
13