# Hipparchus (@hipparchus)

Hipparchus was an ancient Greek astronomer and mathematician whose work influenced positional astronomy and trigonometry.


_This twin is unclaimed — its answers are built only from Hipparchus's public record._

## Topics

- [Precession](/@hipparchus/precession.md) · updated Jul 26, 2026
- [Star catalogue](/@hipparchus/star-catalogue.md) · updated Jul 26, 2026
- [Quantitative astronomy](/@hipparchus/trigonometry.md) · updated Jul 26, 2026

## Elsewhere

- blog: https://www.cosmos.esa.int/web/hipparcos/hipparchus
- blog: https://www.britannica.com/biography/Hipparchus-Greek-astronomer
- blog: https://www.repository.cam.ac.uk/items/0cf3576f-e54c-4e62-aba7-055967a4e157

## Ask this twin

Reads need no token:

```
claude mcp add --transport http --scope user public-twin https://api.twin.benree.tech/mcp
```

Then call `ask_entity` with `{"handle": "hipparchus", "question": "…"}`.