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Full Moon Declination Simulator
HK defaultFull Moon is opposite the Sun, so its declination is roughly the opposite of the Sun's. In HK summer the full Moon stays lower; in winter it rides higher.
Full Moon declination ≈ -23.4° · opposite the Sun on day 172
Before you start
Full moon is opposite the Sun, so its declination is roughly the opposite of the Sun’s. Winter full moons ride high.
Key idea
From Hong Kong, a December full moon transits higher than a June full moon.
What you see
- Night path across the HK sky
- Day-of-year slider
Try this
- Set day 172 (June) vs day 355 (December)
- Read the transit altitude
Why it matters in Hong Kong
Latitude 22.3°N plus opposite-Sun declination sets how high the full moon climbs.
Common mistakes
- Thinking the Moon is always ~45° up
Glossary
- Transit
- Crossing the meridian — highest for that night.