Solar Shading Design: Pat Heung, Hong Kong

Direct answer

For Pat Heung at 22.4461, 114.0923, 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 12689063 in administrative area NYL, at 22.4461, 114.0923; 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 shading design 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 Pat Heung?

Pat Heung is represented here at approximately 22.4461, 114.0923 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 shading design 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 shading-workflow page is a project-starting worksheet, not a design value or approval. The controlling authority and qualified professionals for the Pat Heung site remain authoritative.

Pat Heung monthly solar geometry check for solar shading design

Pat Heung solar-geometry fingerprint at 22.4461, 114.0923

• Pat Heung, 21 January: declination -20.14°, noon altitude 47.42°, zenith 42.58°, geometric daylight 10.838 hours, and vertical-object noon shadow ratio 0.919.
• Pat Heung, 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.
• Pat Heung, 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.
• Pat Heung, 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.
• Pat Heung, 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.
• Pat Heung, 21 June: declination +23.45°, noon altitude 89.00°, zenith 1.00°, geometric daylight 13.376 hours, and vertical-object noon shadow ratio 0.018.
• Pat Heung, 21 July: declination +20.44°, noon altitude 88.00°, zenith 2.00°, geometric daylight 13.181 hours, and vertical-object noon shadow ratio 0.035.
• Pat Heung, 21 August: declination +11.75°, noon altitude 79.31°, zenith 10.69°, geometric daylight 12.657 hours, and vertical-object noon shadow ratio 0.189.
• Pat Heung, 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.
• Pat Heung, 21 October: declination -11.75°, noon altitude 55.80°, zenith 34.20°, geometric daylight 11.343 hours, and vertical-object noon shadow ratio 0.680.
• Pat Heung, 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.
• Pat Heung, 21 December: declination -23.45°, noon altitude 44.10°, zenith 45.90°, geometric daylight 10.624 hours, and vertical-object noon shadow ratio 1.032.

Harth computed the Pat Heung fingerprint for latitude 22.4461° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 114.0923° 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: Pat Heung, Hong Kong
• Solar Altitude & Azimuth: Pat Heung, Hong Kong
• Daylight & Orientation: Pat Heung, Hong Kong
• Solar Shading Design: New Territories, Hong Kong
• All solar & daylight data guidance for Hong Kong
• House Construction Cost Planning: Pat Heung, Hong Kong SAR, China
• Office Construction Cost Planning: Pat Heung, Hong Kong SAR, China
• Retail Construction Cost Planning: Pat Heung, Hong Kong SAR, China
• School Construction Cost Planning: Pat Heung, Hong Kong SAR, China

Sources and method

Location data from the GeoNames HK dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 12689063). 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