Sun Calculator

The calculations utilize the SunCalc astronomical library, which provides results accurate to within a few minutes for most locations worldwide. Accuracy depends on coordinate precision — selecting a specific state or city yields better results than country-level coordinates alone.

The golden hour is the period shortly after sunrise and before sunset when sunlight takes on a warm, golden tone due to the sun's low angle. It's universally considered the optimal time for photography and filmmaking.

The golden hour provides the most forgiving and beautiful natural light available. It's when the sun's low angle creates that magical quality that makes ordinary scenes extraordinary.

— Professional Photography Standards

The blue hour occurs just before sunrise and just after sunset, when the sky displays a deep, rich blue hue. This period is highly valued for landscape and cityscape photography due to the unique lighting conditions.

Twilight is divided into three distinct phases based on how far the sun sits below the horizon. Each phase has specific characteristics and practical applications:

Practical Applications

• Aviation: Civil twilight defines when runway lights must be activated
• Maritime: Nautical twilight is crucial for celestial navigation
• Astronomy: Astronomical twilight marks when telescopic observations can begin
• Photography: Each phase offers unique lighting conditions for different styles
• Military: Twilight phases are used in tactical planning and operations

Solar noon is the precise moment when the sun reaches its highest point in the sky for a given location. This represents the sun's maximum altitude angle for that day and is the midpoint of the daylight period.

Key Characteristics

• Sun reaches maximum altitude above horizon
• Shadows are shortest for the day
• Sun crosses the local meridian (north-south line)
• Marks the transition from morning to afternoon sun
• Used as reference point for sundial calibration

Practical Uses

Near the Arctic and Antarctic circles (approximately 66.5° latitude), extreme solar phenomena occur during certain times of the year. The tool accurately handles these special cases and displays available data accordingly.

Latitude-Based Patterns

Yes, absolutely. The date picker allows you to select any past or future date without restrictions. The tool will calculate sunrise, sunset, and all other solar events for that specific day using the same astronomical algorithms.

No. All sun calculations happen entirely within your browser using JavaScript. Your privacy is fully protected through client-side processing.

Local Storage Usage

Your last selected location is stored in your browser's localStorage for convenience. This data:

• Remains on your device only
• Can be cleared by clearing browser data
• Is not accessible to other websites
• Never leaves your computer
• Persists between browser sessions for convenience

The annual daylight chart provides a comprehensive year-long visualization of how sunrise and sunset times shift with the seasons. This powerful tool reveals patterns that aren't immediately obvious from daily data alone.

Key Insights

Visual Elements

• Sunrise curve (top): Shows how sunrise time changes throughout the year
• Sunset curve (bottom): Displays sunset time progression across months
• Daylight band (gold fill): The area between curves represents daylight hours
• Night regions (shaded): Areas above and below show nighttime hours
• Date marker (vertical line): Indicates your currently selected date
• Solstice points: Visible as curve peaks (summer) and valleys (winter)

Practical Applications

The annual daylight chart transforms abstract seasonal concepts into immediate visual understanding. In one glance, you can see what would take months of daily observations to comprehend.

— Astronomical Visualization Standards