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Questions tagged [coordinate-systems]

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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 ...
Alyssa Galicia's user avatar
1 vote
0 answers
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 ...
Outis Nemo's user avatar
5 votes
1 answer
253 views

Visualizing difference in astropy's cylindrical representation

I'm having trouble understanding why these two approaches have different results: ...
Gabriel's user avatar
  • 822
2 votes
1 answer
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 ...
Tmpecho's user avatar
  • 45
0 votes
0 answers
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 ...
LittleCactus's user avatar
1 vote
1 answer
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 ...
EvilJinious1's user avatar
1 vote
0 answers
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 ...
Kazon's user avatar
  • 587
2 votes
0 answers
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 ...
condosz's user avatar
  • 141
3 votes
3 answers
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^...
jlipinski's user avatar
  • 297
1 vote
1 answer
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 ...
Nownuri's user avatar
  • 227
1 vote
1 answer
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 ...
Supremum's user avatar
2 votes
1 answer
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 ...
Kyle's user avatar
  • 127
5 votes
3 answers
3k views

How can I convert my sky coordinate system (RA, Dec) into galactic coordinate system (l, b)?

I am an astro-particle physics PhD student trying to look for a simulation. I was looking for a conversion formula for sky (or celestial or Equatorial) coordinate system using Right Ascension and ...
Kyle's user avatar
  • 127