Lunar versus Solar orbit at solstices

In summary, the author of the article claims that there is a "logical reason why" the Moon mirrors the Sun's movement, but there is no evidence to support this claim. It is possible that this is a natural result of the dynamics of the Sun-Earth-Moon system, but it is not necessarily peculiar.
  • #1
grisly
7
1
Disclaimer: The questions below were raised by an article that's most definitely pseudoscience. The questions themselves have nothing to do with what makes it "pseudo", though, so don't let that put you off, please. :)​
Quoting from [crackpot link removed by mentor] (I'd advise you only to read it in full if you feel that your eye-rolling musculature is in need of a proper workout...)
[T]he Moon mirrors the movement of the Sun in the sky by rising and setting at the same point on the horizon as the Sun does at opposite solstices. For example, this means the Moon rises at midwinter at the same place the Sun does at midsummer. There is no logical reason why the Moon mimics the Sun in this way and it is only meaningful to a human standing on the Earth.
- Firstly, is this true at all? (Many of the other "facts" are misrepresentations or outright lies.)
- If it is true, is this a significant datum, or simply a natural (though not immediately obvious) result of the fundamental dynamics of the Sun-Earth-Moon system and the perspective from which we observe it?
- If it is significant, is it genuinely "peculiar", as the author would have use believe, or is there a ready explanation for it?
- If it is "peculiar"...

Well, I'll halt my train of thought there for now, and continue it at a later point, in the unlikely event that the answers to the preceding questions all turn out to be "yes".

TIA! :)
 
Last edited by a moderator:
Astronomy news on Phys.org
  • #2
No. N/A. N/A. N/A.
 
  • #3
grisly said:
- Firstly, is this true at all?

Nope. The Moon's orbit about the Earth is very complicated and has many perturbations and irregularities. It certainly doesn't rise in exactly the same place in midwinter as the Sun does in midsummer. This can actually be seen just by looking at the period for Lunar nodes, which is about 18.6 years. If the Moon's orbit slowly precesses over time, then its location on the horizon that it rises and sets at will also change. From wiki:

The plane of the lunar orbit precesses in space and hence the lunar nodes precess around the ecliptic, completing a revolution (called a draconic or nodal period, the period of nutation) in 6798.3835 days or 18.612958 years (note that this is not the same length as a saros). The same cycle, measured against an inertial frame of reference such as ICRS (relative to the stars) is 18.599525 years.

See here: https://en.wikipedia.org/wiki/Lunar_theory
https://en.wikipedia.org/wiki/Lunar_node

Since we don't allow discussions debunking pseudoscience, I'm going to have to lock this thread. Your best bet is just to avoid sites like that altogether. Unless you just want a good laugh, of course.:-p
 
  • Like
Likes davenn

1. How does the Earth's tilt affect the orbit of the moon and the sun during the solstices?

The Earth's tilt of 23.5 degrees is responsible for the changing seasons and the position of the sun and moon relative to the Earth. During the solstices, the Earth's tilt causes one hemisphere to be tilted towards the sun and the other hemisphere to be tilted away from the sun, resulting in longer or shorter days depending on the hemisphere's position in its orbit.

2. Which orbit is closer to the Earth during the solstices, the moon or the sun?

The moon's orbit is always closer to the Earth than the sun's orbit. The average distance between the Earth and the moon is about 238,855 miles, while the average distance between the Earth and the sun is about 93 million miles.

3. How does the lunar orbit change during the solstices?

The lunar orbit does not change during the solstices. The moon's orbit around the Earth remains relatively constant throughout the year, with only slight variations due to the Earth's gravitational pull and the moon's elliptical orbit.

4. How does the solar orbit change during the solstices?

The solar orbit does not change during the solstices either. The Earth's orbit around the sun remains relatively constant throughout the year, with only slight variations due to the gravitational pull of other planets in our solar system.

5. Can the lunar and solar orbits ever align during the solstices?

Yes, there are rare occurrences where the lunar and solar orbits align during the solstices. This is known as a solar or lunar eclipse, where the moon blocks the sun's light from reaching the Earth or the Earth blocks the sun's light from reaching the moon. However, this is not a regular or predictable event and can only happen during specific conditions.

Similar threads

  • Astronomy and Astrophysics
Replies
8
Views
2K
  • Astronomy and Astrophysics
Replies
18
Views
3K
  • Astronomy and Astrophysics
Replies
3
Views
928
Replies
17
Views
2K
  • Astronomy and Astrophysics
Replies
6
Views
1K
  • Astronomy and Astrophysics
2
Replies
62
Views
13K
  • Astronomy and Astrophysics
2
Replies
36
Views
15K
  • Sci-Fi Writing and World Building
Replies
21
Views
1K
Replies
2
Views
1K
  • Astronomy and Astrophysics
Replies
10
Views
11K
Back
Top