Jesse_ChenandClaude Opus 5.5
d277cbd8ad
T1 scripts/birth_sky.py: real alt/az of the seven visible grahas (swe.calc_ut + swe.azalt, geometric altitude, azimuth converted from swe's south origin to north-east) and Yale BSC5 stars V<=4.0 (IAU 1976 precession); phase day / twilight_morning / twilight_evening / night. Thin POST /api/birth_sky registration in do_POST (no new handler method, no __new__). T2 GET /api/birth-sky?subject=: birth truth read server side through loadSubjectBirth + prepareChartViewProfile; zod contract; no billing, no writes, no birth data in the response. T3/T4 lib/birth-sky: sentence table, pure Canvas 2D drawBirthSky (night / paper palettes from DESIGN tokens, east on the left, serif headline with 1.5 s font wait), PNG export via navigator.share or Blob + a.download. Chart page prefetches and paints the cover once the chart is ok; the header button appears only when the PNG is ready. Dialog is a lazy chunk. T7 DESIGN §17, VOICE, CONTEXT glossary, CHANGELOG, real-device checklist. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_0199rbQDTsUbCVw84wc8BTFe
89 lines
3.5 KiB
Python
89 lines
3.5 KiB
Python
#!/usr/bin/env python3
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"""Rebuild scripts/data/bright_stars.json from the Yale Bright Star Catalogue.
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Source: Hoffleit & Warren, *The Bright Star Catalogue, 5th Revised Ed.*
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(NASA Astronomical Data Center, 1991), distributed by CDS as VizieR V/50.
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A US-government (NASA ADC) data product, redistributed by CDS without
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restriction; treated as public domain. No star-chart software data is used.
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Usage (the catalogue itself is not committed; the script checks its sha256):
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curl -o /tmp/bsc5_catalog.gz https://cdsarc.cds.unistra.fr/ftp/V/50/catalog.gz
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python3 scripts/build_bright_stars.py /tmp/bsc5_catalog.gz
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"""
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from __future__ import annotations
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import gzip
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import hashlib
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import json
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import sys
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from pathlib import Path
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SOURCE_URL = "https://cdsarc.cds.unistra.fr/ftp/V/50/catalog.gz"
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SOURCE_SHA256 = "3dc44b1e90be8fbe5bcc7656032560f51275f985c7e3f783c9028e1838ec7bed"
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MAX_MAGNITUDE = 4.0
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OUT = Path(__file__).resolve().parent / "data" / "bright_stars.json"
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# Asterism polylines by HR number. Each inner list is one continuous stroke.
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LINES = [
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{"id": "big_dipper", "strokes": [[5191, 5054, 4905, 4660, 4554, 4295, 4301, 4660]]},
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{"id": "cassiopeia", "strokes": [[21, 168, 264, 403, 542]]},
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{
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"id": "orion",
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"strokes": [
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[2061, 1879, 1790],
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[2061, 1948, 1903, 1852, 1790],
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[1948, 2004],
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[1852, 1713],
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],
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},
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]
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def _parse(raw: bytes) -> list[dict]:
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stars: list[dict] = []
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for line in raw.decode("latin-1").splitlines():
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if len(line) < 107 or not line[75:77].strip() or not line[102:107].strip():
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continue # HR entries without a J2000 position or V magnitude (novae, removed objects)
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vmag = float(line[102:107])
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if vmag > MAX_MAGNITUDE:
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continue
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hr = int(line[0:4])
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ra = (int(line[75:77]) + int(line[77:79]) / 60 + float(line[79:83]) / 3600) * 15
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dec = int(line[84:86]) + int(line[86:88]) / 60 + int(line[88:90]) / 3600
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if line[83] == "-":
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dec = -dec
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stars.append({"hr": hr, "ra": round(ra, 5), "dec": round(dec, 5), "vmag": vmag})
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return stars
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def main(path: str) -> None:
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packed = Path(path).read_bytes()
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digest = hashlib.sha256(packed).hexdigest()
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if digest != SOURCE_SHA256:
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raise SystemExit(f"sha256 mismatch: {digest}")
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stars = _parse(gzip.decompress(packed))
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known = {star["hr"] for star in stars}
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for line in LINES:
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for stroke in line["strokes"]:
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missing = [hr for hr in stroke if hr not in known]
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if missing:
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raise SystemExit(f"{line['id']} needs HR {missing} brighter than {MAX_MAGNITUDE}")
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payload = {
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"source": "Yale Bright Star Catalogue, 5th Revised Ed. (Hoffleit & Warren 1991), VizieR V/50",
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"source_url": SOURCE_URL,
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"source_sha256": SOURCE_SHA256,
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"license": "Public domain (NASA Astronomical Data Center product, redistributed by CDS without restriction)",
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"selection": f"V magnitude <= {MAX_MAGNITUDE}; J2000.0 equinox and epoch; proper motion not applied",
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"fields": ["hr", "ra_deg_j2000", "dec_deg_j2000", "vmag"],
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"generator": "scripts/build_bright_stars.py",
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"lines": LINES,
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"stars": [[s["hr"], s["ra"], s["dec"], s["vmag"]] for s in stars],
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}
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OUT.write_text(json.dumps(payload, ensure_ascii=False, separators=(",", ":")) + "\n", encoding="utf-8")
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print(f"{len(stars)} stars -> {OUT}")
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if __name__ == "__main__":
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main(sys.argv[1] if len(sys.argv) > 1 else "/tmp/bsc5_catalog.gz")
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