Solar & Daylight Data
Daylight & Orientation: Pasir Gudang, Malaysia
How to research daylight & orientation for a specific site in Pasir Gudang — 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 MY dump](https://download.geonames.org/export/dump/MY.zip) (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1732722). Regulatory starting point: [the applicable state and local authority](https://jkt.kpkt.gov.my/). 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 Pasir Gudang at 1.4620, 103.9053, the declination-only solar-noon altitude is approximately 68.0° at the June solstice, 88.5° at an equinox and 65.1° 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 1732722 in administrative area 01, at 1.4620, 103.9053; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 68.0° at the June solstice, 88.5° at an equinox and 65.1° at the December solstice. Representative 21st-day geometry ranges from about 11.9 hours in December to 12.1 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 daylight and building orientation 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 Pasir Gudang?
Pasir Gudang is represented here at approximately 1.4620, 103.9053 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 daylight and building orientation 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 daylight-workflow page is a project-starting worksheet, not a design value or approval. The controlling authority and qualified professionals for the Pasir Gudang site remain authoritative.
Pasir Gudang monthly solar geometry check for daylight & orientation
| Representative date | Declination | Solar-noon altitude | Geometric daylight | Noon shadow / height |
|---|---|---|---|---|
| 21 January | -20.14° | 68.40° | 11.929 h | 0.396 |
| 21 February | -11.23° | 77.31° | 11.961 h | 0.225 |
| 21 March | -0.40° | 88.13° | 11.999 h | 0.033 |
| 21 April | +11.58° | 79.88° | 12.040 h | 0.178 |
| 21 May | +20.14° | 71.32° | 12.071 h | 0.338 |
| 21 June | +23.45° | 68.01° | 12.085 h | 0.404 |
| 21 July | +20.44° | 71.02° | 12.073 h | 0.344 |
| 21 August | +11.75° | 79.71° | 12.041 h | 0.182 |
| 21 September | -0.20° | 88.34° | 11.999 h | 0.029 |
| 21 October | -11.75° | 76.78° | 11.959 h | 0.235 |
| 21 November | -20.44° | 68.10° | 11.927 h | 0.402 |
| 21 December | -23.45° | 65.09° | 11.915 h | 0.464 |
Pasir Gudang solar-geometry fingerprint at 1.4620, 103.9053
- Pasir Gudang, 21 January: declination -20.14°, noon altitude 68.40°, zenith 21.60°, geometric daylight 11.929 hours, and vertical-object noon shadow ratio 0.396.
- Pasir Gudang, 21 February: declination -11.23°, noon altitude 77.31°, zenith 12.69°, geometric daylight 11.961 hours, and vertical-object noon shadow ratio 0.225.
- Pasir Gudang, 21 March: declination -0.40°, noon altitude 88.13°, zenith 1.87°, geometric daylight 11.999 hours, and vertical-object noon shadow ratio 0.033.
- Pasir Gudang, 21 April: declination +11.58°, noon altitude 79.88°, zenith 10.12°, geometric daylight 12.040 hours, and vertical-object noon shadow ratio 0.178.
- Pasir Gudang, 21 May: declination +20.14°, noon altitude 71.32°, zenith 18.68°, geometric daylight 12.071 hours, and vertical-object noon shadow ratio 0.338.
- Pasir Gudang, 21 June: declination +23.45°, noon altitude 68.01°, zenith 21.99°, geometric daylight 12.085 hours, and vertical-object noon shadow ratio 0.404.
- Pasir Gudang, 21 July: declination +20.44°, noon altitude 71.02°, zenith 18.98°, geometric daylight 12.073 hours, and vertical-object noon shadow ratio 0.344.
- Pasir Gudang, 21 August: declination +11.75°, noon altitude 79.71°, zenith 10.29°, geometric daylight 12.041 hours, and vertical-object noon shadow ratio 0.182.
- Pasir Gudang, 21 September: declination -0.20°, noon altitude 88.34°, zenith 1.66°, geometric daylight 11.999 hours, and vertical-object noon shadow ratio 0.029.
- Pasir Gudang, 21 October: declination -11.75°, noon altitude 76.78°, zenith 13.22°, geometric daylight 11.959 hours, and vertical-object noon shadow ratio 0.235.
- Pasir Gudang, 21 November: declination -20.44°, noon altitude 68.10°, zenith 21.90°, geometric daylight 11.927 hours, and vertical-object noon shadow ratio 0.402.
- Pasir Gudang, 21 December: declination -23.45°, noon altitude 65.09°, zenith 24.91°, geometric daylight 11.915 hours, and vertical-object noon shadow ratio 0.464.
Harth computed the Pasir Gudang fingerprint for latitude 1.4620° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 103.9053° 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.
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Sources and method
Location data from the GeoNames MY dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1732722). Regulatory starting point: the applicable state and local authority. 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 daylight and building orientation record for Pasir Gudang establish?
The daylight and building orientation record for Pasir Gudang establishes a reproducible discovery point at 1.4620, 103.9053 (GeoNames ID 1732722, administrative area 01) and a Malaysia source path. It does not establish a final project value, approval or parcel decision.
What must be replaced before using this daylight and building orientation workflow for a project in Pasir Gudang?
For the daylight and building orientation record in Pasir Gudang, replace the 1.4620, 103.9053 city reference with the surveyed site or parcel, identify the competent local authority, and verify the current documents under Uniform Building By-Laws and state or local-authority adoption. Record the edition, retrieval date, units, assumptions and named checker before relying on the result.
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