# Questions tagged [coordinate-systems]

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1 vote
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### Can anyone check my code that converts RA/DEC to galactic coordinates?

Hello, I am collecting some data and need to convert some units, so I built a small script to convert RA/DEC to galactic coordinates. The data has specifically formatted the coordinates as shown in ...
1 vote
52 views

### How is the amount and direction of the Sun's axial tilt as observed from other planets calculated?

Not long ago I asked this question; turns out that was fairly simple to figure out given the equatorial coordinates of the Sun's north pole (just convert to ecliptic coordinates, and see when the Sun ...
• 245
253 views

### Visualizing difference in astropy's cylindrical representation

I'm having trouble understanding why these two approaches have different results: ...
• 822
112 views

### Implementing polar coordinates correctly in solar system model?

I am working on a 2d solar system model using Python, but I'm unsure if my implementation of planet data is correct. I have the planet data stored in polar form (distance, velocity and angle), and I ...
• 45
164 views

### Correct longitude from longitude over 180°

Last week, one of my exercise tasks was about determining the an observer's position on Earth, when in their zenith is a certain star with known right ascension and declination. We were supposed to ...
1 vote
58 views

### Orekit converting to galactic coordinates

I started using OreKit in a 3D star charting app I am writing in JavaFX. I wanted to convert from equatorial to galactic coordinates. I can do it simply by using the transformations, but I wanted to ...
• 111
1 vote
47 views

### Equatorial Co-Ordinates of the Solar Barycentre

Does anyone know where the solar barycentre is in the old equatorial (based on Earth's position on midday, 01/01/2000) system? I want to add an ICRS option for a 3d model I'm working on. EDIT: degrees ...
• 587
187 views

### How to transform between horizontal and equatorial coordinates?

I want to express the transformation between horizontal (azimuth $A$,elevation/altitude $\varepsilon$) coordinates and equatorial (hourangle $H$/right ascension $\alpha$, declination $\delta$) as a ...
• 141
182 views

### Reverse polynomial model for reverse astrometry

I have a polynomial model that can transform pixel X,Y coordinates to standard $\xi, \eta$. This model looks like this: \$\xi/\eta = a_1 + a_2x + a_3y + a_4x^2 + a_5xy + a_6y^2 + a_7x^3 + a_8x^2y+a_9xy^...
• 297
1 vote
260 views

### Angular distance calculation in Equatorial and Galactic coordinates

I calculated the angular distance between the Galactic Center and Andromeda in Equatorial and Galactic coordinates and observed that the distance is calculated differently depending on the coordinate ...
• 227
1 vote
57 views

### Transforming radio sources in a T-RECS catalogue from one field to another

I have sources that I extracted from The Tiered Radio Extragalactic Continuum Simulation (T-RECS) catalogue for a deep field. I use these sources to generate a sky model at different fields within a ...
• 11
146 views

### Discrepancies in the equations for converting Horizontal coordinates to Equatorial coordinates

Hello I am trying to convert my Horizontal coordinate system dataset into Equatorial coordinate system. However, it seems that all the information from the internet is different. I will use symbols as ...
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