Search FQXi


If you are aware of an interesting new academic paper (that has been published in a peer-reviewed journal or has appeared on the arXiv), a conference talk (at an official professional scientific meeting), an external blog post (by a professional scientist) or a news item (in the mainstream news media), which you think might make an interesting topic for an FQXi blog post, then please contact us at forums@fqxi.org with a link to the original source and a sentence about why you think that the work is worthy of discussion. Please note that we receive many such suggestions and while we endeavour to respond to them, we may not be able to reply to all suggestions.

Please also note that we do not accept unsolicited posts and we cannot review, or open new threads for, unsolicited articles or papers. Requests to review or post such materials will not be answered. If you have your own novel physics theory or model, which you would like to post for further discussion among then FQXi community, then please add them directly to the "Alternative Models of Reality" thread, or to the "Alternative Models of Cosmology" thread. Thank you.

Forum Home
Introduction
Terms of Use

Order posts by:
 chronological order
 most recent first

Posts by the author are highlighted in orange; posts by FQXi Members are highlighted in blue.

By using the FQXi Forum, you acknowledge reading and agree to abide by the Terms of Use

 RSS feed | RSS help
RECENT POSTS IN THIS TOPIC

Andrej Rehak: on 7/3/14 at 15:29pm UTC, wrote Video Image Video URL ...


RECENT FORUM POSTS

Marcel-Marie LeBel: "Georgina, There is no instantaneity along the rod or within the coffee. It..." in The Nature of Time

Stefan Weckbach: "Hi Lorraine, thanks for your explanations. I think I now better..." in The Present State of...

Georgina Woodward: "Consider ice cream in hot coffee. They stay together, 'in time', as..." in The Nature of Time

Mykel Waggoner: "This is a link to a paper I wrote, as it explains how Quantum Entanglement..." in Alternative Models of...

Lorraine Ford: "Hi Stefan, Replying to your last couple of posts, this is the way I would..." in The Present State of...

Robert McEachern: ""There are more things in heaven and earth, Horatio, than are dreamt of in..." in Undecidability,...

Georgina Woodward: "Max? Why?" in Anatomy of spacetime and...

Steve Agnew: "Mueller opens his essay with... "As the argument goes, there are truths..." in Undecidability,...


RECENT ARTICLES
click titles to read articles

The Quantum Clock-Maker Investigating COVID-19, Causality, and the Trouble with AI
Sally Shrapnel, a quantum physicist and medical practitioner, on her experiments into cause-and-effect that could help us understand time’s arrow—and build better healthcare algorithms.

Connect the Quantum Dots for a New Kind of Fuel
'Artificial atoms' allow physicists to manipulate individual electrons—and could help to reduce energy wastage in electronic devices.

Can Choices Curve Spacetime?
Two teams are developing ways to detect quantum-gravitational effects in the lab.

The Quantum Engine That Simultaneously Heats and Cools
Tiny device could help boost quantum electronics.

The Quantum Refrigerator
A tiny cooling device could help rewrite the thermodynamic rule book for quantum machines.


FQXi FORUM
September 21, 2021

CATEGORY: Show Me the Physics! Video Contest (2014) [back]
TOPIC: regression of lunar nodes by Andrej Rehak [refresh]
Bookmark and Share
Login or create account to post reply or comment.

Andrej Rehak wrote on Jul. 3, 2014 @ 15:29 GMT
Video Image





Video URL

https://www.youtube.com/watch?v=KNeyfAyW8Sk



Video Description

The ancient Greeks observed that the positions of ascending and descending nodes at which the Moon passes through the fixed plane of the Earth's orbit around the Sun, the ecliptic, decrease, i.e. orbit the Earth in the opposite direction to the Moon, in such a rate that the cycle of that regression amounts almost exactly 18.6 Earth's years. In other words, if the Moon, during the spring or autumn equinox, when viewed from stationary point on Earth, ascends at a certain position on the east horizon, describes the curve of its path and descends at another particular point on the west horizon, it would take 18.6 years for this trajectory to be repeated. In past centuries, developing lunar theory, many famous mathematicians and astronomers have dealt with described problem (Newton, Clairaut, D'Alembert, Euler, Laplace, Damoiseau, Plana, Poisson, Hansen, De Pontécoulant, J. Herschel, Airy, Delaunay, G.W. Hill, E.W. Brown) indicating its inherent difficulty and the theoretical and practical importance. Presented geometry accurately predicts the described cycle. Relative to Earth, Moons trail draws torus. For artistic purposes, in this video, geometry is adapted to exactly mach 18 years cycle. Its mathematical description can be red at: http://www.principiauniversi.com/blogs/11-2-dot-1-regression
-of-lunar-nodes The background sound is a clip from the soundtrack “Symphonies of planets” recorded by NASA’s Voyager.

Video Creator Bio

Andrej Rehak finished High School for Mathematics and Informatics and graduated sculpture on Academy of Fine Arts in Zagreb. He does computer animation and searches for patterns in motions and shapes.

Bookmark and Share


Login or create account to post reply or comment.

Please enter your e-mail address:
Note: Joining the FQXi mailing list does not give you a login account or constitute membership in the organization.