# Credits — Gece Yarısı Gözlemevi (F07)

No photographs, no generated imagery. Every picture on the page is drawn at run time from the data below.

## Data

| Asset | Source | Author | Licence |
|---|---|---|---|
| `data/sky.json` — 8,404 stars to magnitude 6.5 (J2000 position, V magnitude, B−V) | Yale Bright Star Catalogue, 5th revised ed. (catalogue V/50), https://cdsarc.cds.unistra.fr/ftp/V/50/ | D. Hoffleit & W. H. Warren Jr. (1991), via CDS Strasbourg | Public astronomical catalogue, distributed by CDS; acknowledged here as CDS requests |
| `data/sky.json` — constellation lines, label positions, Turkish/English constellation names | d3-celestial `constellations.lines.json`, `constellations.json`, https://github.com/ofrohn/d3-celestial | Olaf Frohn | BSD-3-Clause, `data/d3-celestial-LICENSE.txt` |
| Planet positions (computed) | "Approximate Positions of the Planets", Table 1, https://ssd.jpl.nasa.gov/planets/approx_pos.html | E. M. Standish, JPL/Caltech | Published elements (formulae, no files copied) |
| Sun, Moon, sidereal time, precession, magnitudes (computed) | Astronomical Almanac low-precision formulae; IAU 1982 GMST; Meeus, *Astronomical Algorithms* | — | Formulae |
| Galactic frame | Hipparcos equatorial→galactic rotation | ESA | Formula |

`data/build-sky.py` rebuilds `sky.json` from the two downloaded sources. Positions were checked against JPL Horizons
(see NOTES.md).

## Fonts (self-hosted woff2, latin + latin-ext)

| Face | Use | Source | Licence |
|---|---|---|---|
| Big Shoulders (variable) | signage, headings, controls | Google Fonts / https://github.com/xotypeco/big_shoulders | SIL OFL 1.1, `fonts/OFL-bigshoulders.txt` |
| Literata (variable, roman + italic) | text | Google Fonts / https://github.com/googlefonts/literata | SIL OFL 1.1, `fonts/OFL-literata.txt` |
| Doto (variable) | departure board only | Google Fonts / https://github.com/oliverlalan/Doto | SIL OFL 1.1, `fonts/OFL-doto.txt` |

## Libraries (shared, `../shared/vendor/`)

Three.js r180 (MIT), GSAP 3.13 with ScrollTrigger and ScrambleText (GSAP standard licence, free), Lenis 1.3 (MIT).

## Placeholders and example data

Observing site (37.0° N, 30.3° E, western Taurus) is an example location; the site's measured sky class, prices,
group size, service days, policies (weather, refunds, children), meeting point and contact details are placeholders.
The programme is labelled as an example. All sky times are computed for the chosen date at that example location.