AstroLearn HK
All tools

Sun's Position on Horizon

HK default
day of year
latitude
sun hour angle

Sunrise ~5.3h · Sunset ~18.7h

Before you start

Where the Sun rises and sets on the horizon changes through the year. This affects day length and how high the Sun climbs.

Key idea

In summer the Sun rises north of east and sets north of west (N. hemisphere), spending more time above the horizon. Winter is the reverse.

What you see

  • Horizon panorama with rise/set positions
  • Hong Kong view toggle
  • Step-by-step reasoning panel

Try this

  1. Set day to summer solstice — Sun rises northeast in HK
  2. Set day to winter solstice — Sun rises southeast
  3. Read the 'Why' panel for the three-step explanation

Why it matters in Hong Kong

Even in Hong Kong's subtropical climate, you'll notice summer sunrises further north than winter.

Common mistakes

  • Assuming the Sun always rises due east
  • Forgetting the effect is reversed in the southern hemisphere

Glossary

Summer solstice
Longest day in the northern hemisphere (~June 21).

Related tools