03 / Between day and night

Follow the
changing
light.

From the last glow to the deepest night.

Understand the light. Find your darkness.

Explore the night’s light

Estimated light nowCalculatingWeather adjusted light estimate

Choose your location to explore the light.Calculated for you

Estimated light now: Calculating
Next rise or set · Checking the date: Calculating
Dark window · Checking the date: Calculating
Moon free darkness: Calculating

01 / The daily rhythm

See the night become day.

Explore sunlight, moonlight and the hours in between.

Calculating the Moon and Sun paths for your location.

Explanatory website graph. The watch draws the Moon’s curve and sunlight background, without a Sun curve or numbered axes.

Drag to explore the light

Start of graph12 hours laterEnd of graph

Select a time on the graphCalculating light

The graph follows your selected location and time. Choose a weather condition in the preview controls to see its effect on estimated moonlight. This website does not receive your Garmin weather. Terrain and artificial light are not included. Values are calculated, not measured.

02 / When the Moon steps away

Make room for the stars.

Your moon free window in the next 24 hours.

Calculating Calculating

The Sun is more than 18° below the horizon, and the Moon is below its visible horizon.

Starts: Calculating
Ends: Calculating
From now: Calculating

Checking the local date. If darkness is already underway, the duration shows the time remaining. The window covers the next 24 hours. Actual visibility also depends on your surroundings.

03 / Read the light

Different readings. A clearer picture.

Estimated light

What reaches your location.

An estimate in lux, combining weather adjusted moonlight, sunlight or twilight and a small background level. On the watch, Garmin weather adjusts the moonlight contribution. The four bars give a quick reading of the same estimate.

Moon illumination

What the Sun lights up.

The percentage of the Moon’s visible disc that is illuminated. This reading is independent of whether the Moon is above your horizon.

Sunlight background

Where the day stands.

Day, civil twilight, nautical twilight, astronomical twilight and night follow the Sun’s altitude. Night alone does not mean moon free darkness.

How weather changes moonlight

Garmin weather refines the estimate on your watch. The current condition reduces only the calculated moonlight contribution. Daylight, twilight and the small background contribution are calculated separately.

Moonlight factor
Weather condition	Factor
Clear or mostly clear	1.0
Partly cloudy	about 0.6
Mostly cloudy	about 0.3
Overcast, fog or precipitation	about 0.1

These are approximate model factors, not a light sensor measurement. Terrain, artificial light and local cloud variations can still change the conditions you see.

The weather factor does not change the Moon phase, illumination, rise or set times, or the astronomical dark window.

The same story, on your watch.

Hatching marks moon free darkness on colour displays. Monochrome uses dense dots. The separate strip below the graph marks traditional solunar periods.

Calculated watch preview for your selected location. Added website labels explain the readings.

Get on Connect IQ ↗Read the graph