# ECI ↔ ECEF Transformations

Generic transformations using common "Earth-Centered Inertial" and "Earth-Centered Earth-Fixed" naming convention. Currently maps to GCRF ↔ ITRF transformations.

**note**
For conceptual explanations and examples, see [ECI ↔ ECEF Transformations](../../learn/frames/eci_ecef.md) in the Learn section.

## ECI to ECEF

::: brahe.state_eci_to_ecef

::: brahe.rotation_eci_to_ecef

::: brahe.position_eci_to_ecef

## ECEF to ECI

::: brahe.state_ecef_to_eci

::: brahe.rotation_ecef_to_eci

::: brahe.position_ecef_to_eci

## See Also

- [GCRF ↔ ITRF Transformations](gcrf_itrf.md) - Detailed API for underlying reference frames
- [Reference Frames Module](index.md) - Complete API reference for frames module