# Questions tagged [precession]

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### What effects does the motion of the Sun have on the perihelion precession of Mercury?

According to the wikipedia page, there are multiple effects contributing to the perihelion precession of Mercury. Of course, according to this link and this link we know that the Sun is itself ...
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### Position of the Sun in the constellation Pisces around the year 1500

I am reading a book on ancient astronomy and it claims that around the year 1500 the position of the sun, at the time of the spring equinox, was on the tail end of the second fish in the constellation ...
156 views

### Is Earth's climate significantly different when the one solstice occurs at aphelion rather than the other?

I mean different in some kind of significantlly non-symmetrical way, such as it being much colder during one period rather than the other? Let's assume other factors, such as tilt due to nutation and ...
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### How can the oblateness of Earth impart torque to change the longitude of ascending node of a satellite?

I've read that you can change the longitude of ascending node of a satellite (i.e. changing the orbital plane without changing the inclination) to change its orbital plane by using the torque imparted ...
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### How to write a normalized, dimensionless form of Binet's relativistic equation?

$$\frac{\delta^2 u}{\delta \theta^2} + u = \frac{\mu}{h^2} + 3 \mu u^2$$ This is Binet's relativistic equation. Here $u = 1/r$ where $r$ is the radial distance, and $\mu$ is the reduced mass of the ...
50 views

### How would one figure out the rate of axial precession of a planet?

I want to start with the fact that I am by no means an astronomer, or even a hobbyist in the field. I am attempting to build a fantasy world which still reflects accepted physical laws. My problem ...
268 views

### Is the equinox Sun always at the same zodiac sign in the ecliptic belt?

During the year the Sun moves along the ecliptic passing all the signs of the zodiac belt, in my understanding. This means that it takes ~1 month to go from one zodiac sign to the next. The ...
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### Does a planet's rotation speed and distance from its star influence the precession of its axis? And is the Earth's precession “normal”?

I guess first off, do all/most planets with a tilted axis experience precession? And if so, is it usually in the same direction (clockwise or anticlockwise)? What I'm really curious about is if a ...
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### Is a precession rate of -0.67 radians/orbit plausible?

I came across the paper Rodin & Starovoit (2018) about the possible existence of a planet around the pulsar PSR B0525+21, which suggests the existence of a 0.387 Earth mass planet with the ...
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### what is the net effect of nodal and apsidal lunar precession?

In apsidal lunar precession, the moon's elliptic major axis precesses eastward and completes one revolution eastward in 8.85 years. Because the orbit is inclined relative to the ecliptic, basic ...
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### Does the rotation of galaxies precess?

Does the axis of a galaxy as a whole "wobble" the same way that the Earth does? If so do we have any idea how much or how fast the Milky Way is doing so?
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### Why does the precession of the earth affect other planets?

In the Wikipedia article on numerical integration of planetary motion it states: ...the flattening of the Earth causes precession, which causes the axial tilt to change, which affects the long-...
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### Calculation of RA and DEC

I'm currently stuck on a problem. I have the RA and DEC for JD2000: RA = 17 57 48.49980 DEC = + 04 41 36.1114 I want to calculate the RA and DEC for 01.01.2017, how can I do it? The solution ...
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### Axial wobble or binary star system

Is our solar system affected by a body unobserved as of yet that causes our solar system to curve through space in an orbit? Is this idea outlandish or us there any evidence to support it? Consider ...
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### Season cycle < Year?

Is it possible for a planet's axis to precess or wobble in such a way that its season cycle is of lesser duration than its year? The gyroscopic precession will thus give seasons to one or the other ...
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### Relationship between precession and dating ancient alignments

Perusing the topics here. I am convinced that this is the right place to get some answers. Although it does appear that my question should be relegated to the "childrens table". I am curious to ...