# Coordinate Systems

This chapter explains coordinate systems and conversions in Healpix-geo.

## Indexing Schemes

HEALPix supports three main schemes:

- **Nested** (recommended)
- **Ring**
- **Zuniq** (for MOC)

For more details, see:

- {doc}`../tutorials/coordinate_conversion` - Conversion Tutorial
- {doc}`../healpix/index` - HEALPix Introduction