South Downs stargazing forecast — Saturday, August 15

Best observing window tonight

No clear window of 2+ hours during tonight's astronomical night.

Astronomical night

Sat 9:24 p.m. → Sun 6:51 a.m.

Moon

Waxing crescent · 7% illuminated

Mean cloud (during night)

88%   (min 38%)

Site

South Downs is the darkest DarkSky Reserve within 90 minutes of London — a rare feat in one of Europe's brightest regions. Chalk downland ridges shield the core zones from the coastal glow.

Drive from Toronto: ≈ 90 min from central London via the A3 or M23.

Best time of year: October–March. Aim for the 3–4 nights around each new moon and pick a spot on the far side of a ridge from Portsmouth/Brighton.

Citations & data sources

• Open-Meteo Forecast API (cloud, humidity, wind, visibility)
• Open-Meteo astronomical data (sunrise, sunset, moon)
• Bortle scale reference for site darkness
• Editorial guide for South Downs: /sites/south-downs-idsr.txt
• Structured site data: /sites/south-downs-idsr.json
• Live MCP server (AI agents): https://koohxdehsweadgdegrly.supabase.co/functions/v1/mcp

This is a build-time snapshot — the live forecast at https://ontarionightsky.com/?site=south-downs-idsr updates continuously.