Solar & Daylight Data
Sun Path: Sembawang Estate, Singapore
How to research sun path for a specific site in Sembawang Estate — the controlling authority, source documents, and checks to run before you rely on a number.
Last updated August 31, 2026 · Location data from the [GeoNames SG dump](https://download.geonames.org/export/dump/SG.zip) (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1880283). Regulatory starting point: [Building and Construction Authority](https://www1.bca.gov.sg/regulatory-info/building-control). 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.
Direct answer
For Sembawang Estate at 1.4508, 103.8286, 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 1880283 in administrative area 00, at 1.4508, 103.8286; 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 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 Sembawang Estate?
Sembawang Estate is represented here at approximately 1.4508, 103.8286 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?
- 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 sun-path-workflow page is a project-starting worksheet, not a design value or approval. The controlling authority and qualified professionals for the Sembawang Estate site remain authoritative.
Which related searches does this primary location record cover?
This primary route consolidates the location evidence needed for Sun Path, Solar Altitude & Azimuth, Solar Shading Design, Daylight & Orientation. A narrower route should be released only when it adds a materially different official source, calculation, process, threshold or worked example.
Sembawang Estate monthly solar geometry check for sun path
| Representative date | Declination | Solar-noon altitude | Geometric daylight | Noon shadow / height |
|---|---|---|---|---|
| 21 January | -20.14° | 68.41° | 11.929 h | 0.396 |
| 21 February | -11.23° | 77.32° | 11.962 h | 0.225 |
| 21 March | -0.40° | 88.15° | 11.999 h | 0.032 |
| 21 April | +11.58° | 79.87° | 12.040 h | 0.179 |
| 21 May | +20.14° | 71.31° | 12.071 h | 0.338 |
| 21 June | +23.45° | 68.00° | 12.084 h | 0.404 |
| 21 July | +20.44° | 71.01° | 12.072 h | 0.344 |
| 21 August | +11.75° | 79.70° | 12.040 h | 0.182 |
| 21 September | -0.20° | 88.35° | 11.999 h | 0.029 |
| 21 October | -11.75° | 76.80° | 11.960 h | 0.235 |
| 21 November | -20.44° | 68.11° | 11.928 h | 0.402 |
| 21 December | -23.45° | 65.10° | 11.916 h | 0.464 |
Sembawang Estate solar-geometry fingerprint at 1.4508, 103.8286
- Sembawang Estate, 21 January: declination -20.14°, noon altitude 68.41°, zenith 21.59°, geometric daylight 11.929 hours, and vertical-object noon shadow ratio 0.396.
- Sembawang Estate, 21 February: declination -11.23°, noon altitude 77.32°, zenith 12.68°, geometric daylight 11.962 hours, and vertical-object noon shadow ratio 0.225.
- Sembawang Estate, 21 March: declination -0.40°, noon altitude 88.15°, zenith 1.85°, geometric daylight 11.999 hours, and vertical-object noon shadow ratio 0.032.
- Sembawang Estate, 21 April: declination +11.58°, noon altitude 79.87°, zenith 10.13°, geometric daylight 12.040 hours, and vertical-object noon shadow ratio 0.179.
- Sembawang Estate, 21 May: declination +20.14°, noon altitude 71.31°, zenith 18.69°, geometric daylight 12.071 hours, and vertical-object noon shadow ratio 0.338.
- Sembawang Estate, 21 June: declination +23.45°, noon altitude 68.00°, zenith 22.00°, geometric daylight 12.084 hours, and vertical-object noon shadow ratio 0.404.
- Sembawang Estate, 21 July: declination +20.44°, noon altitude 71.01°, zenith 18.99°, geometric daylight 12.072 hours, and vertical-object noon shadow ratio 0.344.
- Sembawang Estate, 21 August: declination +11.75°, noon altitude 79.70°, zenith 10.30°, geometric daylight 12.040 hours, and vertical-object noon shadow ratio 0.182.
- Sembawang Estate, 21 September: declination -0.20°, noon altitude 88.35°, zenith 1.65°, geometric daylight 11.999 hours, and vertical-object noon shadow ratio 0.029.
- Sembawang Estate, 21 October: declination -11.75°, noon altitude 76.80°, zenith 13.20°, geometric daylight 11.960 hours, and vertical-object noon shadow ratio 0.235.
- Sembawang Estate, 21 November: declination -20.44°, noon altitude 68.11°, zenith 21.89°, geometric daylight 11.928 hours, and vertical-object noon shadow ratio 0.402.
- Sembawang Estate, 21 December: declination -23.45°, noon altitude 65.10°, zenith 24.90°, geometric daylight 11.916 hours, and vertical-object noon shadow ratio 0.464.
Harth computed the Sembawang Estate fingerprint for latitude 1.4508° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 103.8286° 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 SG dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1880283). Regulatory starting point: Building and Construction 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.
Source links
Frequently asked questions
What does the sun path record for Sembawang Estate establish?
The sun path record for Sembawang Estate establishes a reproducible discovery point at 1.4508, 103.8286 (GeoNames ID 1880283, administrative area 00) and a Singapore source path. It does not establish a final project value, approval or parcel decision.
What must be replaced before using this sun path workflow for a project in Sembawang Estate?
For the sun path record in Sembawang Estate, replace the 1.4508, 103.8286 city reference with the surveyed site or parcel, identify the competent local authority, and verify the current documents under Building Control Regulations, BCA Approved Documents, and applicable Singapore Standards. Record the edition, retrieval date, units, assumptions and named checker before relying on the result.
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