Sun Path: Tiu Keng Leng, Hong Kong

Direct answer

For Tiu Keng Leng at 22.2985, 114.2511, the declination-only solar-noon altitude is approximately 88.9° at the June solstice, 67.7° at an equinox and 44.3° 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 1818550 in administrative area KKT, at 22.2985, 114.2511; 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 44.3° 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 sun path record.

Prepared by Harth · Prepared from the cited location and country sources; local project inputs remain unreviewed · Published 2026-08-26 · Updated 2026-08-31.

What must be verified for Tiu Keng Leng?

Tiu Keng Leng is represented here at approximately 22.2985, 114.2511 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 sun path 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 sun-path-workflow page is a project-starting worksheet, not a design value or approval. The controlling authority and qualified professionals for the Tiu Keng Leng site remain authoritative.

Tiu Keng Leng monthly solar geometry check for sun path

Tiu Keng Leng solar-geometry fingerprint at 22.2985, 114.2511

• Tiu Keng Leng, 21 January: declination -20.14°, noon altitude 47.56°, zenith 42.44°, geometric daylight 10.847 hours, and vertical-object noon shadow ratio 0.914.
• Tiu Keng Leng, 21 February: declination -11.23°, noon altitude 56.48°, zenith 33.52°, geometric daylight 11.377 hours, and vertical-object noon shadow ratio 0.663.
• Tiu Keng Leng, 21 March: declination -0.40°, noon altitude 67.30°, zenith 22.70°, geometric daylight 11.978 hours, and vertical-object noon shadow ratio 0.418.
• Tiu Keng Leng, 21 April: declination +11.58°, noon altitude 79.28°, zenith 10.72°, geometric daylight 12.643 hours, and vertical-object noon shadow ratio 0.189.
• Tiu Keng Leng, 21 May: declination +20.14°, noon altitude 87.84°, zenith 2.16°, geometric daylight 13.153 hours, and vertical-object noon shadow ratio 0.038.
• Tiu Keng Leng, 21 June: declination +23.45°, noon altitude 88.85°, zenith 1.15°, geometric daylight 13.366 hours, and vertical-object noon shadow ratio 0.020.
• Tiu Keng Leng, 21 July: declination +20.44°, noon altitude 88.14°, zenith 1.86°, geometric daylight 13.172 hours, and vertical-object noon shadow ratio 0.032.
• Tiu Keng Leng, 21 August: declination +11.75°, noon altitude 79.46°, zenith 10.54°, geometric daylight 12.653 hours, and vertical-object noon shadow ratio 0.186.
• Tiu Keng Leng, 21 September: declination -0.20°, noon altitude 67.50°, zenith 22.50°, geometric daylight 11.989 hours, and vertical-object noon shadow ratio 0.414.
• Tiu Keng Leng, 21 October: declination -11.75°, noon altitude 55.95°, zenith 34.05°, geometric daylight 11.347 hours, and vertical-object noon shadow ratio 0.676.
• Tiu Keng Leng, 21 November: declination -20.44°, noon altitude 47.26°, zenith 42.74°, geometric daylight 10.828 hours, and vertical-object noon shadow ratio 0.924.
• Tiu Keng Leng, 21 December: declination -23.45°, noon altitude 44.25°, zenith 45.75°, geometric daylight 10.634 hours, and vertical-object noon shadow ratio 1.026.

Harth computed the Tiu Keng Leng fingerprint for latitude 22.2985° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 114.2511° 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?

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Sources and method

Location data from the GeoNames HK dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1818550). 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.

Source links

• download.geonames.org

• bd.gov.hk

• gml.noaa.gov