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# Astropy Core Package Documentation

Welcome to the `astropy` documentation! `astropy` is a community-driven package intended to contain much of the core functionality and some common tools needed for performing astronomy and astrophysics with Python.

## User Documentation

### What’s New in Astropy 0.3?

Astropy at a glance

- Overview
- Installation
- Getting Started with Astropy

Core data structures and transformations

- Constants (`astropy.constants`)
- Units and Quantities (`astropy.units`)
- N-dimensional datasets (`astropy.nddata`)
- Data Tables (`astropy.table`)
- Time and Dates (`astropy.time`)
- Astronomical Coordinate Systems (`astropy.coordinates`)
- World Coordinate System (`astropy.wcs`)
- Models And Fitting (`astropy.modeling`)

Connecting up: Files and I/O

- Unified file read/write interface
- FITS File handling (`astropy.io.fits`)
- ASCII Tables (`astropy.io.ascii`)
- VOTable XML handling (`astropy.io.votable`)
- Miscellaneous Input/Output (`astropy.io.misc`)

Astronomy computations and utilities

- Convolution and filtering (`astropy.convolution`)
- Cosmological Calculations (`astropy.cosmology`)
- Astrostatistics Tools (`astropy.stats`)
- Virtual Observatory Access (`astropy.vo`)

Nuts and bolts of Astropy

- Configuration system (`astropy.config`)
- I/O Registry (`astropy.io.registry`)
- Logging system
- Python warnings system
- Astropy Core Package Utilities (`astropy.utils`)

Astropy project details

- Current status of sub-packages
- Major Release History
- Known Issues
- Authors and Credits
- Licenses

## Getting help

If you want to get help or discuss issues with other Astropy users, you can sign up for the astropy mailing list. Alternatively, the astropy-dev mailing list is where you should go to discuss more technical aspects of Astropy with the developers.

## Reporting issues

If you have come across something that you believe is a bug, please open a ticket in the Astropy issue tracker, and we will look into it promptly.

Please try to include an example that demonstrates the issue and will allow the developers to reproduce and fix the problem. If you are seeing a crash then frequently it will help to include the full Python stack trace as well as information about your operating system (e.g. MacOSX version or Linux version).

## Developer Documentation

The developer documentation contains instructions for how to contribute to Astropy or affiliated packages, as well as coding, documentation, and testing guidelines. For the guiding vision of this process and the project as a whole, see Vision for a Common Astronomy Python Package.

- How To: Contribute to Astropy
- Coding Guidelines
- Writing Documentation
- Testing Guidelines
- Writing Command-Line Scripts
- Building Astropy and its Subpackages
- C or Cython Extensions
- Release Procedures
- Full Changelog

## Indices and Tables

- Index
- Module Index
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