# Precession betrays Nemesis position?

• Andre
In summary: Earth's orbit?The twin would have to have a lot of gravity to move the sun, otherwise its effect would be negligible.

#### Andre

In 1995 Richard Muller et al proposed the existence of a twin star of the sun, Nemesis. This would expain the cyclic mass extinctions. To date there seems to be little substantiation for the existence of Nemesis and the only remaining option is: find it.

That may be happening here:

http://newfrontiersinscience.com/Members/v02n01/a/NFS0201a.shtml#fnB2 [Broken]

In the new model, our Sun curves through space. This motion of the Sun causes an apparent wobble to an observer on Earth, thus producing a precession of the equinox without creating any seasonal shifting issues, and without requiring any movement of the equinoctial points on the Earth’s orbit path...
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According to Newtonian physics the only force that could cause the Sun to display such a curve would be another large mass to which the Sun is gravitationally bound, which is by definition a binary star system. In this model, the Copernican Third Motion of the Earth [6] would be caused primarily by the Sun’s curved path in a binary orbit, rather than by lunisolar forces

Apparantly the precession of the Equinoxes is not caused by gravity of the sun and moon but by the orbit of the sun in space, as it must be influenced by a twin star. Is this Nemesis? And can we calculate it's position from the apparent precession?

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No. Precession is caused by the gravity of the sun and Relativity AFAIK.

Sounds like another Planet X hoax.

a quickie:
Sidereal vs. Solar Time : Why is the delta (time difference) between a sidereal and solar day attributed to the curvature of the Earth's orbit (around the Sun), but the delta between a sidereal "year" and solar year attributed to precession?
The length of a day and the length of a year have nothing at all to do with each other.

Does sound somewhat crackpotish. It would appear that what these fellows are basing their theory on is the need for some explanation of precession other than the Sun and Moon. However, I was allways under the impression that precession is a natural result of gyroscopic forces and occurs ni nearly all rotating objects. Not only would Earth's gyroscopic precession take place without another star, it would take place even without the Sun and Moon, wouldn't it?

Also, I believe the mass extinctions in the Earth's past have been chronologically linked to the Solar system's orbit around the Milky Way. Currently, we are "above" the plane of the gallaxy, but moving down towards it (I think), which means that at the point in our orbit opposite from where we are now, we will be "below" that plane. It also means that, twice in each orbit, we must pass through the most thickly populated part of the gallactic plane. IIRC, the mass extinctions appear to take place at about these times.

Originally posted by LURCH
Does sound somewhat crackpotish. It would appear that what these fellows are basing their theory on is the need for some explanation of precession other than the Sun and Moon. However, I was allways under the impression that precession is a natural result of gyroscopic forces and occurs ni nearly all rotating objects. Not only would Earth's gyroscopic precession take place without another star, it would take place even without the Sun and Moon, wouldn't it?
There are two different kinds of precession. The precession of the Earth's rotation axis is indeed a gyroscopic effect. But the Earth's ORBIT is also undergoing precession. The positions of perihelion and apahelion are moving.

In any case, I'm pretty sure that's a well known limitation of Newtonian physics which has been explained by Relativity.

Russ, You said
The positions of perihelion and apahelion are moving.
Right, I was under the impression that this was to be contributed to the gravity of the other planets, mostly Jupiter. However, if there was an alleged twin to the sun, that would yield enough gravity pull to move the sun in orbit, then what would its effect be on the Earths orbit?

Moreover, (this is difficult to put in words), if I understand correctly, the scholar view is that Earth spin axis "precesses" due to sun and moon differential gravity on the equatorial bulge. We think we recognise precession because there is a difference between the sidereal year and the tropical year. The sidereal year is the time measured for a completed 360 cycle of the Earth in relation to the stars. While the tropical year (about 20 minutes shorter) looks at the time difference for the sun for reaching the equinoxes. Again this is attibuted to a physical change in the spin axis direction of the Earth.

If I understand correctly, Cruttenden and Dayes assume that the sun moved position in relation to the fixed stars due to the gravity of a twin. So, it is at another position after the completion of a sidereal year. Since we assume that it is not moving, and we measure the position of the fixed stars in relation to the sun, we make an error in our own Earth position. This would seem to cause the sidereal year to happen actually before the completion of the orbit. Now, suppose Earth is only appearing to precess and is not actually changing its spin axis direction. This would mean that the tropical year must resemble a full orbit and the difference in position with the fixed stars tells the movement of the total solar system.

IMHO there is a simply way to establish if the Earth is actually precessing or only apparently. The direction of the spin axis should affect the north/south position of the polar star areas. If there is real precession that position would change relatively fast, if there is only apparent precession, that position would remain about static, only accounting for the parallax caused by the orbit of the solar system.

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The trouble with most folks isn't so much their ignorance. It's know'n so many things that ain't so.
Josh Billings

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Lurch
Not only would Earth's gyroscopic precession take place without another star, it would take place even without the Sun and Moon, wouldn't it?

As far as I understand precession, you need a torque force on the spinning object to change the direction of its spin axis. This torque force is thought to be exerted by the gravity of sun and moon on the oblique turning equatorial bulge of the Earth.

http://www-istp.gsfc.nasa.gov/stargaze/Sprecess.htm

Consequently, we seem to need the sun and moon for the precession.

i was looking at this subject today and i couldn't find an answer i could understand.
is this premise a silly idea or something that needs more research?
do we need to wait for the ir sky mapping satellite to do its thing in november 09?

No, this is just crackpottery. Note also, the thread is 5 years old...

## 1. What is precession?

Precession is a phenomenon in which the axis of rotation of a spinning object, such as a planet or a gyroscope, changes direction over time. This is due to the gravitational pull of other celestial bodies and the shape of the object itself.

## 2. How does precession relate to Nemesis?

Precession is used to track the position of Nemesis, a hypothetical companion to our Sun that may have caused mass extinctions on Earth. By studying the precession of other planets and stars, scientists can estimate the location and orbit of Nemesis.

## 3. What evidence supports the idea of Nemesis?

Some scientists believe that the regular mass extinctions on Earth, such as the one that wiped out the dinosaurs, could be caused by the gravitational influence of a companion star. Additionally, the precession of other stars in our galaxy has been used to support the existence of Nemesis.

## 4. How is precession measured?

Precession is measured by observing the changes in the position and movement of celestial bodies over time. This can be done using telescopes and other instruments that track the movements of stars and planets.

## 5. Is there consensus among scientists about the existence of Nemesis?

There is currently no consensus among scientists about the existence of Nemesis. While some studies have provided evidence for its existence, others have found no significant evidence. Further research and observations are needed to determine the validity of the Nemesis theory.