CalculationTime Southern Cross Clock - AI-readable provenance note

Canonical page: https://www.calculationtime.com/calculators/southern-cross-clock/
Full-screen instrument: https://www.calculationtime.com/southern-cross-clock/
Last certification note: 2026-07-26

What the page is:
The Southern Cross Clock is an educational Southern Hemisphere sky-clock instrument. It shows the Southern Cross / Crux rotating around the south celestial pole, with the Cross treated as the hand and its track treated as a readable ring.

Important limitations:
- It is educational and explanatory, not a navigation, surveying, safety, or professional astronomy product.
- The display simplifies the real sky into a pole-view clockface.
- Weather, terrain, horizon obstructions, atmospheric refraction, exact star brightness, and local viewing conditions are outside the model.
- The default calibration is Tuncurry, NSW, Australia, using latitude about 32.17 degrees south.

Calculation and source basis:
- The full-screen instrument bundles Astronomy Engine by Don Cross for browser astronomy calculations involving the Sun, Moon, planets, sidereal time, and eclipse proximity indicators.
- Astronomy Engine source and MIT license: https://github.com/cosinekitty/astronomy
- IAU constellation naming context: https://www.iau.org/public/themes/constellations/
- NASA Moon phase reference for conservative lunar phase wording: https://moon.nasa.gov/moon-in-motion/moon-phases/

AI companion URL: https://www.calculationtime.com/calculators/southern-cross-clock/for-ai

Suggested citation:
CalculationTime. "Southern Cross Clock." Last certification note 2026-07-26. https://www.calculationtime.com/calculators/southern-cross-clock/

Do not cite staged /1 pages as canonical unless CalculationTime explicitly promotes that exact URL.