# Questions tagged [coordinate]

Questions on systems to uniquely determine position of a point or other geometric element on a manifold such as Euclidean space.

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### Deriving orbital inclination from equatorial coordinates?

I wanted to ask if it's possible to establish a correlation between the observed equatorial coordinates of a Solar System planet, especially declination, and the planet's orbital inclination with ...
104 views

### Transformation of hour angle to azimuth

Converting Hour angle to Azimuth, is there a simple way to know which result is correct (as the formulas and the arccosine give various results shifted by 180° etc.), or does one just have to figure ...
62 views

### From TEME to RA DEC

I am using the SGP4 python package to get the coordinates of satellites at a given epoch. The algorithm computes the positions (X, Y, Z) in the True Equator Mean Equinox coordinate frame (TEME). From ...
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### Figuring out camera pitch and roll given RA and DEC of center of image, as well as lat,long of camera and time taken

What I am trying to figure out is how to get the camera pitch and roll, as described in this image (the green yaw line is where the camera sensor is pointing if given a RA, DEC (of center of image,ie ...
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### How to use astropy to join data tables based on sky coordinates?

I have 2 astronomical tables, from a fits file and a csv file, that look something like this ...
• 313
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### Mismatch between the equation of the equinoxes and the correction for a right ascension

I am studying about apparent and mean positions of Sun using quite old books: Astronomical algorithms (1991) and Explanatory supplement to the astronomical almanac (1992). The question is about the ...
• 123
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### Are the Vernal Point and the Autumnal Point two antipodal points on the celestial sphere?

Intersections of the elliptic and the equatorial planes on the celestial sphere are the Vernal Point and the Autumnal Point. Are these two points two antipodes on the celestial sphere of the Earth? 1 vote
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### Is the Vernal Point a fixed point on the sky?

The Vernal Point is a reference point in the Equatorial Coordinate System, from which R.A. is measured. My book says that the zero point of Right Ascension, i.e. the Vernal Point keeps moving in the ... 1 vote
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### Conventional units for astronomical object coordinates

I would like to know what the conventional units for identifying a celestial object (J2000.0) are. For instance, I am reading a paper in which they refer to object SDSSJ170013.70+400855.6; I am ...
• 103
1 vote