Full Moon Height: When is It Highest?

  • Context: High School 
  • Thread starter Thread starter haiha
  • Start date Start date
  • Tags Tags
    Height Moon
Click For Summary

Discussion Overview

The discussion revolves around the timing of the full moon in relation to its height in the sky, particularly during the winter solstice and equinox. Participants explore the relationship between the moon's position and the tilt of Earth's axis as well as the moon's orbital characteristics.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant notes that the last full moon was observed when the moon was at its lowest point for the year and questions when it might be at its highest.
  • Another participant asserts that the full moon would be highest at the winter solstice, suggesting an inverse relationship between the sun's and moon's positions.
  • A later reply indicates a misunderstanding of the original question, prompting further clarification.
  • Further discussion raises the idea that the tilt of the moon's orbit relative to Earth's orbit does not significantly influence the moon's height at the solstices or equinoxes, with emphasis on the greater impact of Earth's axial tilt.
  • One participant mentions that the tilt of Earth's axis (23.5 degrees) has a more substantial effect than the 5-degree tilt of the moon's orbit, noting that the latter is independent of seasonal changes.

Areas of Agreement / Disagreement

Participants express differing views on the factors influencing the moon's height during full moons, particularly regarding the roles of the moon's orbital tilt and Earth's axial tilt. The discussion remains unresolved with multiple competing perspectives.

Contextual Notes

There are unresolved assumptions regarding the definitions of "highest" and "lowest" in the context of the moon's position, as well as the specific conditions under which these observations are made.

haiha
Messages
136
Reaction score
1
Hi all,

I've just read that the last full moon (29/6) was noted as the moon was lowest in the year. So there can be the full-moon when the moon can be the highest. Is that around Sep23 (equinox) or Dec22 (solstice)?

Thanks.
 
Astronomy news on Phys.org
It would be at the winter soltice. When the Sun is high in the sky the Moon is low in the sky and vice-versa.
 
Janus said:
It would be at the winter soltice. When the Sun is high in the sky the Moon is low in the sky and vice-versa.

So it doesn't have anything to do with the tilt of the moon orbit againt the Earth orbit around the sun?
 
haiha said:
So it doesn't have anything to do with the tilt of the moon orbit againt the Earth orbit around the sun?
That accounts for 5 degrees of it, but the tilt of Earth's axis with respect to Earth's orbital plane (the ecliptic) has a lot more effect as it is 23.5 degrees. And that 5 degrees from the difference in orbital planes is not dependent on the solstices or equinoxes, as the direction it points (longitude of ascending node +-90 degrees) has an 18.2 year cycle that is completely independent of Earth's seasons.
 
Last edited:

Similar threads

  • · Replies 4 ·
Replies
4
Views
3K
  • · Replies 16 ·
Replies
16
Views
5K
  • · Replies 5 ·
Replies
5
Views
2K
  • · Replies 1 ·
Replies
1
Views
3K
  • · Replies 4 ·
Replies
4
Views
958
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 19 ·
Replies
19
Views
3K
  • · Replies 13 ·
Replies
13
Views
3K
  • · Replies 28 ·
Replies
28
Views
5K
  • · Replies 81 ·
3
Replies
81
Views
16K