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Questions tagged [spherical-astronomy]

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7 votes
1 answer

Finding stars that would be visible from satellite

I'm working on a mock image of a picture taken from a satellite (like ISS). Lets say I have a camera on ISS pointing in the direction of velocity (I have this velocity vector defined in ITRF and ...
jlipinski's user avatar
  • 297
5 votes
3 answers

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
2 votes
1 answer

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
2 votes
1 answer

Relation of length of small circle with that of a great circle

This is not the best place to ask such doubts, so please recommend where I can. I currently don't have the facility to ask a teacher specialized for astronomy. So I just got reading- "Astronomy: ...
some random person's user avatar
2 votes
0 answers

Conversion of 1D plot in 3D plot gives different physics

I am to track the path of a particle due to Lorentz force of the planet magnetic field, assuming there is no gravitational force on it. The equation of motion due to Lorentz force in rotating ...
Lunthang Peter's user avatar
1 vote
1 answer

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

Transformation matrices and their derivation (if possible) for ICRS frame for reference to other frames

I am finishing up my thesis write up and one of the chapters in my thesis is on astronomical coordinate systems since in my analysis of data I have converted the available astrometry from the ICRS ...
CTZenScientist's user avatar
1 vote
1 answer

how to calculate ecliptic coordinate of moon's ascending node?

Assume we have the ecliptic coordinate of moon; how can we calculate the ecliptic coordinate of its ascending node? I think one approximate way is to use the moon's coordinate for two subsequent days ...
Amirhessam's user avatar
0 votes
0 answers

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
0 votes
0 answers

Demonstration- formula for angle between horizon and ecliptic

The most precise and quite intuitive formula I could find online is here: $$\cos I = \cos ϵ \sin ϕ − \sin ϵ \cos ϕ \...
astrid lovespie's user avatar
-2 votes
1 answer

Celestial Coordinates / Spherical Trigonometry problem [closed]

A star passes through the zenith at 0h10m of sidereal time, whereas its altitude on the horizon is 78◦12′ at 9h2m of sidereal time. Calculate the latitude of the observer.
Huy Tran's user avatar