Solar & Daylight Data
Sun Path: Naas, Ireland
How to research sun path for a specific site in Naas — 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 IE dump](https://download.geonames.org/export/dump/IE.zip) (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 2962334). Regulatory starting point: [Department of Housing, Local Government and Heritage and the local building-control authority](https://www.gov.ie/en/department-of-housing-local-government-and-heritage/collections/building-standards/). 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 Naas at 53.2158, -6.6669, the declination-only solar-noon altitude is approximately 60.2° at the June solstice, 36.8° at an equinox and 13.3° 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 2962334 in administrative area L, at 53.2158, -6.6669; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 60.2° at the June solstice, 36.8° at an equinox and 13.3° at the December solstice. Representative 21st-day geometry ranges from about 7.3 hours in December to 16.7 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 Naas?
Naas is represented here at approximately 53.2158, -6.6669 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 Naas site remain authoritative.
Naas monthly solar geometry check for sun path
| Representative date | Declination | Solar-noon altitude | Geometric daylight | Noon shadow / height |
|---|---|---|---|---|
| 21 January | -20.14° | 16.65° | 8.084 h | 3.345 |
| 21 February | -11.23° | 25.56° | 9.947 h | 2.091 |
| 21 March | -0.40° | 36.38° | 11.928 h | 1.357 |
| 21 April | +11.58° | 48.36° | 14.121 h | 0.889 |
| 21 May | +20.14° | 56.92° | 15.916 h | 0.651 |
| 21 June | +23.45° | 60.23° | 16.728 h | 0.572 |
| 21 July | +20.44° | 57.23° | 15.987 h | 0.644 |
| 21 August | +11.75° | 48.54° | 14.155 h | 0.884 |
| 21 September | -0.20° | 36.58° | 11.964 h | 1.347 |
| 21 October | -11.75° | 25.03° | 9.845 h | 2.142 |
| 21 November | -20.44° | 16.34° | 8.013 h | 3.410 |
| 21 December | -23.45° | 13.33° | 7.272 h | 4.219 |
Naas solar-geometry fingerprint at 53.2158, -6.6669
- Naas, 21 January: declination -20.14°, noon altitude 16.65°, zenith 73.35°, geometric daylight 8.084 hours, and vertical-object noon shadow ratio 3.345.
- Naas, 21 February: declination -11.23°, noon altitude 25.56°, zenith 64.44°, geometric daylight 9.947 hours, and vertical-object noon shadow ratio 2.091.
- Naas, 21 March: declination -0.40°, noon altitude 36.38°, zenith 53.62°, geometric daylight 11.928 hours, and vertical-object noon shadow ratio 1.357.
- Naas, 21 April: declination +11.58°, noon altitude 48.36°, zenith 41.64°, geometric daylight 14.121 hours, and vertical-object noon shadow ratio 0.889.
- Naas, 21 May: declination +20.14°, noon altitude 56.92°, zenith 33.08°, geometric daylight 15.916 hours, and vertical-object noon shadow ratio 0.651.
- Naas, 21 June: declination +23.45°, noon altitude 60.23°, zenith 29.77°, geometric daylight 16.728 hours, and vertical-object noon shadow ratio 0.572.
- Naas, 21 July: declination +20.44°, noon altitude 57.23°, zenith 32.77°, geometric daylight 15.987 hours, and vertical-object noon shadow ratio 0.644.
- Naas, 21 August: declination +11.75°, noon altitude 48.54°, zenith 41.46°, geometric daylight 14.155 hours, and vertical-object noon shadow ratio 0.884.
- Naas, 21 September: declination -0.20°, noon altitude 36.58°, zenith 53.42°, geometric daylight 11.964 hours, and vertical-object noon shadow ratio 1.347.
- Naas, 21 October: declination -11.75°, noon altitude 25.03°, zenith 64.97°, geometric daylight 9.845 hours, and vertical-object noon shadow ratio 2.142.
- Naas, 21 November: declination -20.44°, noon altitude 16.34°, zenith 73.66°, geometric daylight 8.013 hours, and vertical-object noon shadow ratio 3.410.
- Naas, 21 December: declination -23.45°, noon altitude 13.33°, zenith 76.67°, geometric daylight 7.272 hours, and vertical-object noon shadow ratio 4.219.
Harth computed the Naas fingerprint for latitude 53.2158° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude -6.6669° 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: Droichead Nua, Ireland
- Sun Path: Celbridge, Ireland
- Sun Path: Maynooth, Ireland
- Sun Path: Leixlip, Ireland
- All solar & daylight data guidance for Ireland
- Climate Design Data: Naas, Ireland
Sources and method
Location data from the GeoNames IE dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 2962334). Regulatory starting point: Department of Housing, Local Government and Heritage and the local building-control 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 Naas establish?
The sun path record for Naas establishes a reproducible discovery point at 53.2158, -6.6669 (GeoNames ID 2962334, administrative area L) and a Ireland 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 Naas?
For the sun path record in Naas, replace the 53.2158, -6.6669 city reference with the surveyed site or parcel, identify the competent local authority, and verify the current documents under Building Regulations and Technical Guidance Documents. Record the edition, retrieval date, units, assumptions and named checker before relying on the result.
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