Questions tagged [precession]

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1answer
62 views

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 ...
2
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0answers
43 views

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 ...
2
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1answer
33 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 ...
3
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4answers
163 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 ...
3
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0answers
34 views

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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0answers
46 views

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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0answers
55 views

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 ...
12
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3answers
155 views

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?
4
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1answer
70 views

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-...
0
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1answer
271 views

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 ...
2
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1answer
143 views

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 ...
4
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1answer
89 views

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 ...
3
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1answer
218 views

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 ...
3
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1answer
275 views

nodal precession: earth's orbit of sun

Does the Earth's orbit around the sun exhibit nodal precession, as does the moon's around the Earth? If it does, that must mean that the ecliptic is in a periodic wobble with respect to the celestial ...
2
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0answers
89 views

Was the Crab Nebula to the southeast of Zeta Tauri 1,000 years ago?

I've been reading about SN 1054 and how most professional investigators believe that it is the Crab Nebula today. But the wiki article has this to say: The location of the guest star as "to the ...