Solar Shading Design: Wong Tai Sin, Hong Kong

Direct answer

For Wong Tai Sin at 22.3500, 114.1833, the declination-only solar-noon altitude is approximately 88.9° at the June solstice, 67.7° at an equinox and 44.2° 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 1818304 in administrative area KWT, at 22.3500, 114.1833; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 88.9° at the June solstice, 67.7° at an equinox and 44.2° 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 Wong Tai Sin?

Wong Tai Sin is represented here at approximately 22.3500, 114.1833 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 Wong Tai Sin site remain authoritative.

Wong Tai Sin monthly solar geometry check for solar shading design

Wong Tai Sin solar-geometry fingerprint at 22.3500, 114.1833

• Wong Tai Sin, 21 January: declination -20.14°, noon altitude 47.51°, zenith 42.49°, geometric daylight 10.844 hours, and vertical-object noon shadow ratio 0.916.
• Wong Tai Sin, 21 February: declination -11.23°, noon altitude 56.42°, zenith 33.58°, geometric daylight 11.376 hours, and vertical-object noon shadow ratio 0.664.
• Wong Tai Sin, 21 March: declination -0.40°, noon altitude 67.25°, zenith 22.75°, geometric daylight 11.978 hours, and vertical-object noon shadow ratio 0.419.
• Wong Tai Sin, 21 April: declination +11.58°, noon altitude 79.23°, zenith 10.77°, geometric daylight 12.644 hours, and vertical-object noon shadow ratio 0.190.
• Wong Tai Sin, 21 May: declination +20.14°, noon altitude 87.79°, zenith 2.21°, geometric daylight 13.156 hours, and vertical-object noon shadow ratio 0.039.
• Wong Tai Sin, 21 June: declination +23.45°, noon altitude 88.90°, zenith 1.10°, geometric daylight 13.370 hours, and vertical-object noon shadow ratio 0.019.
• Wong Tai Sin, 21 July: declination +20.44°, noon altitude 88.09°, zenith 1.91°, geometric daylight 13.175 hours, and vertical-object noon shadow ratio 0.033.
• Wong Tai Sin, 21 August: declination +11.75°, noon altitude 79.40°, zenith 10.60°, geometric daylight 12.654 hours, and vertical-object noon shadow ratio 0.187.
• Wong Tai Sin, 21 September: declination -0.20°, noon altitude 67.45°, zenith 22.55°, geometric daylight 11.989 hours, and vertical-object noon shadow ratio 0.415.
• Wong Tai Sin, 21 October: declination -11.75°, noon altitude 55.90°, zenith 34.10°, geometric daylight 11.346 hours, and vertical-object noon shadow ratio 0.677.
• Wong Tai Sin, 21 November: declination -20.44°, noon altitude 47.21°, zenith 42.79°, geometric daylight 10.825 hours, and vertical-object noon shadow ratio 0.926.
• Wong Tai Sin, 21 December: declination -23.45°, noon altitude 44.20°, zenith 45.80°, geometric daylight 10.630 hours, and vertical-object noon shadow ratio 1.028.

Harth computed the Wong Tai Sin fingerprint for latitude 22.3500° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 114.1833° 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: Wong Tai Sin, Hong Kong
• Solar Altitude & Azimuth: Wong Tai Sin, Hong Kong
• Daylight & Orientation: Wong Tai Sin, Hong Kong
• Solar Shading Design: Kowloon City Centre, Hong Kong
• All solar & daylight data guidance for Hong Kong
• House Construction Cost Planning: Wong Tai Sin, Hong Kong SAR, China
• Office Construction Cost Planning: Wong Tai Sin, Hong Kong SAR, China
• Retail Construction Cost Planning: Wong Tai Sin, Hong Kong SAR, China
• School Construction Cost Planning: Wong Tai Sin, Hong Kong SAR, China

Sources and method

Location data from the GeoNames HK dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1818304). 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