Solar & Daylight Data
Solar Shading Design: Nam Cheong, Hong Kong
How to research solar shading design for a specific site in Nam Cheong — the controlling authority, source documents, and checks to run before you rely on a number.
On this page
Last updated September 2, 2026 · Location data from the [GeoNames HK dump](https://download.geonames.org/export/dump/HK.zip) (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 12689055). Regulatory starting point: [Hong Kong Buildings Department](https://www.bd.gov.hk/en/resources/codes-and-references/codes-and-design-manuals/index.html). Figures are illustrative — verify against the current locally adopted edition for the site. Solar-method context: [NOAA Solar Calculation Details](https://gml.noaa.gov/grad/solcalc/calcdetails.html); 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](https://midcdmz.nrel.gov/spa/).
Direct answer
For Nam Cheong at 22.3280, 114.1539, 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 12689055 in administrative area KSS, at 22.3280, 114.1539; 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 Nam Cheong?
Nam Cheong is represented here at approximately 22.3280, 114.1539 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?
- Fix the surveyed site and local time basis.
- Select an authoritative weather source or a named solar-position algorithm.
- Record period, percentile or scenario and units.
- Test sensitivity to elevation, exposure, urban form and horizon.
- Save the source file, retrieval date and checker in the model record.
| Input | Project-specific evidence | QA question |
|---|---|---|
| Site | surveyed coordinates, elevation and horizon | Does the point represent the building? |
| Weather/solar method | named dataset, algorithm, period and time basis | Are station, time zone and units explicit? |
| Design scenario | current and future scenario agreed by the team | Is an average being mistaken for an extreme? |
| Compliance | adopted local document and edition | Was applicability confirmed with the authority? |
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 Nam Cheong site remain authoritative.
Nam Cheong monthly solar geometry check for solar shading design
| Representative date | Declination | Solar-noon altitude | Geometric daylight | Noon shadow / height |
|---|---|---|---|---|
| 21 January | -20.14° | 47.53° | 10.845 h | 0.915 |
| 21 February | -11.23° | 56.45° | 11.377 h | 0.663 |
| 21 March | -0.40° | 67.27° | 11.978 h | 0.419 |
| 21 April | +11.58° | 79.25° | 12.644 h | 0.190 |
| 21 May | +20.14° | 87.81° | 13.155 h | 0.038 |
| 21 June | +23.45° | 88.88° | 13.368 h | 0.020 |
| 21 July | +20.44° | 88.11° | 13.174 h | 0.033 |
| 21 August | +11.75° | 79.43° | 12.654 h | 0.187 |
| 21 September | -0.20° | 67.47° | 11.989 h | 0.415 |
| 21 October | -11.75° | 55.92° | 11.346 h | 0.677 |
| 21 November | -20.44° | 47.23° | 10.826 h | 0.925 |
| 21 December | -23.45° | 44.22° | 10.632 h | 1.028 |
Nam Cheong solar-geometry fingerprint at 22.3280, 114.1539
- Nam Cheong, 21 January: declination -20.14°, noon altitude 47.53°, zenith 42.47°, geometric daylight 10.845 hours, and vertical-object noon shadow ratio 0.915.
- Nam Cheong, 21 February: declination -11.23°, noon altitude 56.45°, zenith 33.55°, geometric daylight 11.377 hours, and vertical-object noon shadow ratio 0.663.
- Nam Cheong, 21 March: declination -0.40°, noon altitude 67.27°, zenith 22.73°, geometric daylight 11.978 hours, and vertical-object noon shadow ratio 0.419.
- Nam Cheong, 21 April: declination +11.58°, noon altitude 79.25°, zenith 10.75°, geometric daylight 12.644 hours, and vertical-object noon shadow ratio 0.190.
- Nam Cheong, 21 May: declination +20.14°, noon altitude 87.81°, zenith 2.19°, geometric daylight 13.155 hours, and vertical-object noon shadow ratio 0.038.
- Nam Cheong, 21 June: declination +23.45°, noon altitude 88.88°, zenith 1.12°, geometric daylight 13.368 hours, and vertical-object noon shadow ratio 0.020.
- Nam Cheong, 21 July: declination +20.44°, noon altitude 88.11°, zenith 1.89°, geometric daylight 13.174 hours, and vertical-object noon shadow ratio 0.033.
- Nam Cheong, 21 August: declination +11.75°, noon altitude 79.43°, zenith 10.57°, geometric daylight 12.654 hours, and vertical-object noon shadow ratio 0.187.
- Nam Cheong, 21 September: declination -0.20°, noon altitude 67.47°, zenith 22.53°, geometric daylight 11.989 hours, and vertical-object noon shadow ratio 0.415.
- Nam Cheong, 21 October: declination -11.75°, noon altitude 55.92°, zenith 34.08°, geometric daylight 11.346 hours, and vertical-object noon shadow ratio 0.677.
- Nam Cheong, 21 November: declination -20.44°, noon altitude 47.23°, zenith 42.77°, geometric daylight 10.826 hours, and vertical-object noon shadow ratio 0.925.
- Nam Cheong, 21 December: declination -23.45°, noon altitude 44.22°, zenith 45.78°, geometric daylight 10.632 hours, and vertical-object noon shadow ratio 1.028.
Harth computed the Nam Cheong fingerprint for latitude 22.3280° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 114.1539° 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: Nam Cheong, Hong Kong
- Solar Altitude & Azimuth: Nam Cheong, Hong Kong
- Daylight & Orientation: Nam Cheong, Hong Kong
- Solar Shading Design: Sham Shui Po, Hong Kong
- All solar & daylight data guidance for Hong Kong
- House Construction Cost Planning: Nam Cheong, Hong Kong SAR, China
- Office Construction Cost Planning: Nam Cheong, Hong Kong SAR, China
- Retail Construction Cost Planning: Nam Cheong, Hong Kong SAR, China
- School Construction Cost Planning: Nam Cheong, Hong Kong SAR, China
Sources and method
Location data from the GeoNames HK dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 12689055). 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
Frequently asked questions
What does the solar shading design record for Nam Cheong establish?
The solar shading design record for Nam Cheong establishes a reproducible discovery point at 22.3280, 114.1539 (GeoNames ID 12689055, administrative area KSS) and a Hong Kong source path. It does not establish a final project value, approval or parcel decision.
What must be replaced before using this solar shading design workflow for a project in Nam Cheong?
For the solar shading design record in Nam Cheong, replace the 22.3280, 114.1539 city reference with the surveyed site or parcel, identify the competent local authority, and verify the current documents under Buildings Ordinance, subsidiary regulations, codes of practice, and practice notes. Record the edition, retrieval date, units, assumptions and named checker before relying on the result.
Related pages
- Solar Shading Design: Naivasha, Kenya
Solar shading design for Naivasha, Kenya: horizontal-overhang P:H ratios at 09:00, noon and 15:00 by month; June noon altitude 65.9°; sizing hand check.
- Solar Shading Design: Najafgarh, India
Solar shading design for Najafgarh, India: horizontal-overhang P:H ratios at 09:00, noon and 15:00 by month; June noon altitude 84.8°; sizing hand check.
- Solar Shading Design: Nakuru, Kenya
Solar shading design for Nakuru, Kenya: horizontal-overhang P:H ratios at 09:00, noon and 15:00 by month; June noon altitude 66.3°; sizing hand check.
- Solar Shading Design: Nanyuki, Kenya
Solar shading design for Nanyuki, Kenya: horizontal-overhang P:H ratios at 09:00, noon and 15:00 by month; June noon altitude 66.6°; sizing hand check.
- Solar Shading Design: Narok, Kenya
Solar shading design for Narok, Kenya: horizontal-overhang P:H ratios at 09:00, noon and 15:00 by month; June noon altitude 65.5°; sizing hand check.
- Solar Shading Design: Nashik, India
Solar shading design for Nashik, India: horizontal-overhang P:H ratios at 09:00, noon and 15:00 by month; June noon altitude 86.6°; sizing hand check.