Solar Time
The Sun keeps its own time. On a solar clock, the Sun reaches its daily meridian at 12:00.
00:12
A solar sense test
Can you read the sky?
No clock. No numbers. Just the Sun. Guess the time the Sun is keeping.
Solar Time
What time is it?
By the Sun, not your phone.
Your guess
Result
You said
14:37
The Sun said
14:52
15 minutes off.
Your phone follows a time zone. SOLAR follows the Sun above your place.
No account
No advertising
On-device solar calculations
SOLAR for iPhone
The Sun is your clock. See where you are in the day.
Read the day
Sunrise behind you. Sunset ahead.
SOLAR turns the day into something you can understand at a glance. The luminous arc shows where you are between the next two horizon events.
How the solar day works
How much day is left?
10h 38m
of daylight. A quiet measure of the day still in front of you.
One instant
Four ways to read time.
The sky does not change when you change clocks. Only the way the same moment is named.
Seasonal Hours
Daylight is divided into twelve equal hours, and night into twelve more. Their length changes with the season.
Byzantine Time
A new equal-hour cycle begins at sunset and continues through the following day.
Local Time
The standard civil time your phone uses, kept nearby as the familiar reference.
Solar Reminders
Remind me when the light changes.
A fixed alarm stays at the same clock time. A Solar Reminder follows the event as sunrise, golden hour, sunset and dawn move through the year.
See Solar RemindersGolden hour30 minutes before
SunsetAt the event
Civil dawn10 minutes before
A living clear sky
Night does not begin all at once.
Daylight fades through civil, nautical and astronomical twilight. Stars emerge. Dawn returns. The clear-sky visual follows the real solar state for your selected place.
How SOLAR worksLearn by looking
What time is noon?
Time was not always one thing. Explore Solar Time, changing hours, sunset-based time and the different kinds of twilight.
Explore SOLAR timeQuestions
A clock, not a weather app.
What is Solar Time?
Solar Time reads the apparent Sun at the selected place. Its 12:00 is local solar noon, when the Sun crosses the local meridian.
Does SOLAR predict clouds or rain?
No. The visual sky represents a clear-sky atmospheric state driven by the Sun. It does not forecast local weather.
Why is Solar Time different from my phone?
Your phone uses a standard time zone. Solar Time follows the apparent Sun at your longitude and changes with the equation of time.
Does the arc show the real altitude of the Sun?
The Halo arc is a temporal cycle from sunrise to sunset, or sunset to sunrise. It shows progress through the day or night rather than claiming to be a camera projection.
Does SOLAR need an account?
No. The current product is designed without accounts, advertising or a social feed.
What happens to my location?
You may use a one-time current location or search for a place. The selected place is stored locally and core solar calculations run on the device.
SOLAR for iPhone
The Sun is your clock.
Time, daylight and the changing sky for your place.
Play Daily Sky