Solar Day

Solar Day Solar Day is a clean, privacy-first app for understanding today’s daylight hours and your position in the solar year. Designed for people who rely on natural light — whether for solar energy systems, off-grid living, photovoltaic power, battery charging, or personal wellbeing — Solar Day provides a clear view of sunrise, sunset, solar angle, and seasonal change. Free Version • Daylight duration • Sunrise and sunset (local time) • Seasonal solar year graphic • Days to next solstice • 7-day daylight change • Manual location entry or GPS Solar Day helps you build real intuition about daily and seasonal sunlight patterns — without notifications, accounts, or distractions. SolarDay Pro (One-Time Upgrade) SolarDay Pro adds deeper solar energy context and planning tools: • Solar Effectiveness (5-level indicator) Negligible • Poor • Moderate • Good • Excellent Combines seasonal solar inclination with atmospheric conditions (cloud cover and haze reduce — but never increase — the seasonal baseline) • Effective Sun Hours • Effective Sun Window • 3-Day Cloud Cover Outlook • Solar Inclination Graphic (visual sun angle) • Contextual seasonal guidance No subscriptions. One purchase. Lifetime unlock. Payments are securely handled by Google Play. Privacy Solar Day is built with respect for users. • No accounts • No ads • No analytics • No tracking Core solar calculations run entirely on your device. If you use SolarDay Pro, cloud cover data is retrieved from a public weather service to provide short-term atmospheric context. No personal data is collected, stored, or sold. Solar Day is developed by Sparrow Hill — thoughtful tools built with clarity and restraint.