🏙️ Sky brightness — trims deep-sky verdicts to what a city sky really shows
✨ Double & carbon stars — moon-proof showpieces
Tight star pairs and vivid red carbon stars punch straight through moonlight and Woodlands' light pollution — ideal when the faint fuzzies are washed out. Best in the 30 cm dome at high power.
📅 Conjunctions & special events — next 3 weeks from the chosen date
🛰️ Satellite passes — ISS · Tiangong · Hubble · 7–11 pm on the chosen night
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📋 Session run-sheet — suggested per-instrument plan
Andromeda dome: 30 cm (12") reflector — the observatory's main telescope. Rooftop: Takahashi Sky 90 (90 mm f/5.6 fluorite apo refractor) — wide-field & beginner-friendly. Moon & bright planets → rooftop Sky 90 (fast, queue-friendly) · planet detail, globular cores & faint deep-sky → 30 cm dome on dark nights.
Tip: add this page to your home screen (Share → Add to Home Screen) to open it like an app. Pick any date & time to plan — everything is computed on-device and works offline.
Moon, planet positions & target altitudes computed on your phone for the date & time you pick. Weather notes are seasonal guidance — use the Nowcast for the live call.
Sources: deep-sky catalogue — AstroPixels Messier & Caldwell catalogs (F. Espenak) · planetary elements — P. Schlyter · weather — MSS Weather.gov.sg & Open-Meteo · seeing/transparency — 7Timer! · light-pollution realism — Bortle scale · haze — NEA via data.gov.sg · sky events — Sea & Sky astronomy calendar · ISS/Tiangong/Hubble orbits — CelesTrak TLEs via satellite.js · Jupiter/Saturn detail — J. Meeus series, GRS longitude per JUPOS trend · rain radar — MSS · Andromeda Observatory.