Sun & Moon
Sunrise, sunset, day length and the live moon phase for anywhere on Earth — computed, not guessed
The Moon tonight
Equation of time vs axial tilt
Times are derived from published astronomy formulas for your exact coordinates and date — no lookup tables, no network dependency, no waiting.
The golden arc shows today's full sun path with the sun parked at its present position, so remaining daylight registers at a glance.
Tonight's crescent, illumination percentage and moon age sit beside the next full and new moon dates — everything photographers and stargazers ask first.
Why Sunrise Times Wander Through the Year
Most people know days get longer in summer and shorter in winter, but the finer pattern surprises them: the earliest sunset happens weeks before the winter solstice, and the latest sunrise weeks after it. That skew comes from two effects adding up — Earth's tilted axis changes the sun's daily height, while its slightly elliptical orbit makes the solar day itself stretch and shrink by seconds, which accumulate into minutes across a season.
What this page shows
- 🌅 A horizon dial tracing today's sun path, with the dot parked where the sun is right now
- 🕛 Solar noon — the true meridian crossing, not the clock's noon
- 🌙 Tonight's moon phase with the illuminated percentage and the moon's age in days
- 📅 The next full moon and next new moon dates
Reading the dial
The dashed arc is the sun's journey between the two horizon crossings; its height above the horizon line at mid-arc reflects how high the sun climbs, which shrinks toward zero as you approach the polar circles in winter. Near those latitudes the arc can fail to cross the horizon at all — that is exactly when the midnight-sun and polar-night notices appear.
Under the hood
- Solar times use the NOAA sunrise equation with a −0.83° horizon altitude to account for refraction.
- Moon phases advance from the 2000-01-06 18:14 UTC new moon by the mean synodic month of 29.53059 days.
- All results are computed server-side per request — there is nothing cached to go stale.
- Dates are interpreted as UTC calendar days to stay stable across time zones and DST transitions.
Why Sunrise Times Wander Through the Year
Most people know days get longer in summer and shorter in winter, but the finer pattern surprises them: the earliest sunset happens weeks before the winter solstice, and the latest sunrise weeks after it. That skew comes from two effects adding up — Earth's tilted axis changes the sun's daily height, while its slightly elliptical orbit makes the solar day itself stretch and shrink by seconds, which accumulate into minutes across a season.
What this page shows
- 🌅 A horizon dial tracing today's sun path, with the dot parked where the sun is right now
- 🕛 Solar noon — the true meridian crossing, not the clock's noon
- 🌙 Tonight's moon phase with the illuminated percentage and the moon's age in days
- 📅 The next full moon and next new moon dates
Reading the dial
The dashed arc is the sun's journey between the two horizon crossings; its height above the horizon line at mid-arc reflects how high the sun climbs, which shrinks toward zero as you approach the polar circles in winter. Near those latitudes the arc can fail to cross the horizon at all — that is exactly when the midnight-sun and polar-night notices appear.
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