Solar Altitude & Azimuth: Yuen Long Kau Hui, Hong Kong

Direct answer

For Yuen Long Kau Hui at 22.4483, 114.0320, the declination-only solar-noon altitude is approximately 89.0° at the June solstice, 67.6° at an equinox and 44.1° at the December solstice. Refine these geometry checks with the project date, civil time, facade azimuth, terrain and local horizon. The reproducible location record is GeoNames ID 1818223 in administrative area NYL, at 22.4483, 114.0320; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 89.0° at the June solstice, 67.6° at an equinox and 44.1° at the December solstice. Representative 21st-day geometry ranges from about 10.6 hours in December to 13.4 hours in June; this excludes atmospheric refraction, terrain and obstruction effects. The cited national authority is a discovery starting point; current local documents and a named qualified reviewer control project use of this solar altitude and azimuth record.

Content and cited inputs reviewed by Scott Barrington, Harth founder and architectural technology specialist · Published 2026-08-26 · Updated 2026-09-02.

What must be verified for Yuen Long Kau Hui?

Yuen Long Kau Hui is represented here at approximately 22.4483, 114.0320 for discovery and workflow planning. A project address, parcel, elevation, exposure, authority, and submission date must replace that city-centre reference before design use.

How should solar altitude and azimuth be established?

1. Fix the surveyed site and local time basis.
2. Select an authoritative weather source or a named solar-position algorithm.
3. Record period, percentile or scenario and units.
4. Test sensitivity to elevation, exposure, urban form and horizon.
5. Save the source file, retrieval date and checker in the model record.

What are the limits of this worksheet?

This solar-angle-workflow page is a project-starting worksheet, not a design value or approval. The controlling authority and qualified professionals for the Yuen Long Kau Hui site remain authoritative.

Yuen Long Kau Hui monthly solar geometry check for solar altitude & azimuth

Yuen Long Kau Hui solar-geometry fingerprint at 22.4483, 114.0320

• Yuen Long Kau Hui, 21 January: declination -20.14°, noon altitude 47.41°, zenith 42.59°, geometric daylight 10.838 hours, and vertical-object noon shadow ratio 0.919.
• Yuen Long Kau Hui, 21 February: declination -11.23°, noon altitude 56.33°, zenith 33.67°, geometric daylight 11.373 hours, and vertical-object noon shadow ratio 0.666.
• Yuen Long Kau Hui, 21 March: declination -0.40°, noon altitude 67.15°, zenith 22.85°, geometric daylight 11.978 hours, and vertical-object noon shadow ratio 0.421.
• Yuen Long Kau Hui, 21 April: declination +11.58°, noon altitude 79.13°, zenith 10.87°, geometric daylight 12.647 hours, and vertical-object noon shadow ratio 0.192.
• Yuen Long Kau Hui, 21 May: declination +20.14°, noon altitude 87.69°, zenith 2.31°, geometric daylight 13.162 hours, and vertical-object noon shadow ratio 0.040.
• Yuen Long Kau Hui, 21 June: declination +23.45°, noon altitude 89.00°, zenith 1.00°, geometric daylight 13.377 hours, and vertical-object noon shadow ratio 0.017.
• Yuen Long Kau Hui, 21 July: declination +20.44°, noon altitude 87.99°, zenith 2.01°, geometric daylight 13.181 hours, and vertical-object noon shadow ratio 0.035.
• Yuen Long Kau Hui, 21 August: declination +11.75°, noon altitude 79.31°, zenith 10.69°, geometric daylight 12.658 hours, and vertical-object noon shadow ratio 0.189.
• Yuen Long Kau Hui, 21 September: declination -0.20°, noon altitude 67.35°, zenith 22.65°, geometric daylight 11.989 hours, and vertical-object noon shadow ratio 0.417.
• Yuen Long Kau Hui, 21 October: declination -11.75°, noon altitude 55.80°, zenith 34.20°, geometric daylight 11.342 hours, and vertical-object noon shadow ratio 0.680.
• Yuen Long Kau Hui, 21 November: declination -20.44°, noon altitude 47.11°, zenith 42.89°, geometric daylight 10.819 hours, and vertical-object noon shadow ratio 0.929.
• Yuen Long Kau Hui, 21 December: declination -23.45°, noon altitude 44.10°, zenith 45.90°, geometric daylight 10.623 hours, and vertical-object noon shadow ratio 1.032.

Harth computed the Yuen Long Kau Hui fingerprint for latitude 22.4483° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 114.0320° is retained for a later civil-time conversion; this screen does not perform that conversion. See NOAA's solar calculation details. Atmospheric refraction, terrain, facade azimuth and obstructions remain outside this first-pass comparison.

Where can you explore related guidance?

• Explore all solar data guidance
• Sun Path: Yuen Long Kau Hui, Hong Kong
• Solar Shading Design: Yuen Long Kau Hui, Hong Kong
• Daylight & Orientation: Yuen Long Kau Hui, Hong Kong
• Solar Altitude & Azimuth: Yuen Long, Hong Kong
• All solar & daylight data guidance for Hong Kong
• House Construction Cost Planning: Yuen Long Kau Hui, Hong Kong SAR, China
• Office Construction Cost Planning: Yuen Long Kau Hui, Hong Kong SAR, China
• Retail Construction Cost Planning: Yuen Long Kau Hui, Hong Kong SAR, China
• School Construction Cost Planning: Yuen Long Kau Hui, Hong Kong SAR, China

Sources and method

Location data from the GeoNames HK dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1818223). Regulatory starting point: Hong Kong Buildings Department. Figures are illustrative — verify against the current locally adopted edition for the site. Solar-method context: NOAA Solar Calculation Details; the Harth monthly table uses a simpler declination and geometric-daylight approximation whose stated limitations must be retained. Project-date refinement reference: NREL Solar Position Algorithm.

Source links

• download.geonames.org

• bd.gov.hk

• gml.noaa.gov

• midcdmz.nrel.gov