AstroLearn HK
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Daylight Hours Explorer

HK default
Hours of Daylight per Day at 41.0° N

an observer at a latitude of 41.0° N
will receive 13.9 hours of
daylight on May 2

latitude:
day of year:

May 2

Before you start

How many hours of daylight do you get? It depends on latitude and the date — explore the pattern through the year.

Key idea

The Sun's declination and your latitude together determine how long the Sun stays above the horizon each day.

What you see

  • Daylight hours number for selected latitude and date
  • Yearly chart showing the seasonal wave

Try this

  1. Start at Hong Kong latitude and read today's daylight hours
  2. Move to 45°N and compare the larger seasonal swing
  3. Find which month has the most daylight in HK

Why it matters in Hong Kong

Hong Kong's daylight ranges from about 10.5 to 13.5 hours — a moderate seasonal variation.

Common mistakes

  • Assuming 12 h daylight everywhere always
  • Forgetting polar day/night at extreme latitudes

Glossary

Photoperiod
The period of daily light exposure.

Related tools

daylight simulatortransit seasons