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Updated 2026-09-02

Solar & Daylight Data

Daylight & Orientation: Finglas, Ireland

How to research daylight & orientation for a specific site in Finglas — the controlling authority, source documents, and checks to run before you rely on a number.

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Last updated September 2, 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 2964303). 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. Project-date refinement reference: [NREL Solar Position Algorithm](https://midcdmz.nrel.gov/spa/).

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Direct answer

For Finglas at 53.3892, -6.2969, the declination-only solar-noon altitude is approximately 60.0° at the June solstice, 36.6° at an equinox and 13.2° 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 2964303 in administrative area L, at 53.3892, -6.2969; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 60.0° at the June solstice, 36.6° at an equinox and 13.2° at the December solstice. Representative 21st-day geometry ranges from about 7.2 hours in December to 16.8 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 Finglas?

Finglas is represented here at approximately 53.3892, -6.2969 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?

  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.
InputProject-specific evidenceQA question
Sitesurveyed coordinates, elevation and horizonDoes the point represent the building?
Weather/solar methodnamed dataset, algorithm, period and time basisAre station, time zone and units explicit?
Design scenariocurrent and future scenario agreed by the teamIs an average being mistaken for an extreme?
Complianceadopted local document and editionWas 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 Finglas site remain authoritative.

Finglas monthly solar geometry check for daylight & orientation

Representative dateDeclinationSolar-noon altitudeGeometric daylightNoon shadow / height
21 January-20.14°16.47°8.057 h3.382
21 February-11.23°25.38°9.934 h2.107
21 March-0.40°36.21°11.928 h1.366
21 April+11.58°48.19°14.134 h0.894
21 May+20.14°56.75°15.943 h0.656
21 June+23.45°60.06°16.763 h0.576
21 July+20.44°57.05°16.015 h0.648
21 August+11.75°48.36°14.169 h0.889
21 September-0.20°36.41°11.964 h1.356
21 October-11.75°24.86°9.831 h2.159
21 November-20.44°16.17°7.985 h3.449
21 December-23.45°13.16°7.237 h4.277

Finglas solar-geometry fingerprint at 53.3892, -6.2969

  • Finglas, 21 January: declination -20.14°, noon altitude 16.47°, zenith 73.53°, geometric daylight 8.057 hours, and vertical-object noon shadow ratio 3.382.
  • Finglas, 21 February: declination -11.23°, noon altitude 25.38°, zenith 64.62°, geometric daylight 9.934 hours, and vertical-object noon shadow ratio 2.107.
  • Finglas, 21 March: declination -0.40°, noon altitude 36.21°, zenith 53.79°, geometric daylight 11.928 hours, and vertical-object noon shadow ratio 1.366.
  • Finglas, 21 April: declination +11.58°, noon altitude 48.19°, zenith 41.81°, geometric daylight 14.134 hours, and vertical-object noon shadow ratio 0.894.
  • Finglas, 21 May: declination +20.14°, noon altitude 56.75°, zenith 33.25°, geometric daylight 15.943 hours, and vertical-object noon shadow ratio 0.656.
  • Finglas, 21 June: declination +23.45°, noon altitude 60.06°, zenith 29.94°, geometric daylight 16.763 hours, and vertical-object noon shadow ratio 0.576.
  • Finglas, 21 July: declination +20.44°, noon altitude 57.05°, zenith 32.95°, geometric daylight 16.015 hours, and vertical-object noon shadow ratio 0.648.
  • Finglas, 21 August: declination +11.75°, noon altitude 48.36°, zenith 41.64°, geometric daylight 14.169 hours, and vertical-object noon shadow ratio 0.889.
  • Finglas, 21 September: declination -0.20°, noon altitude 36.41°, zenith 53.59°, geometric daylight 11.964 hours, and vertical-object noon shadow ratio 1.356.
  • Finglas, 21 October: declination -11.75°, noon altitude 24.86°, zenith 65.14°, geometric daylight 9.831 hours, and vertical-object noon shadow ratio 2.159.
  • Finglas, 21 November: declination -20.44°, noon altitude 16.17°, zenith 73.83°, geometric daylight 7.985 hours, and vertical-object noon shadow ratio 3.449.
  • Finglas, 21 December: declination -23.45°, noon altitude 13.16°, zenith 76.84°, geometric daylight 7.237 hours, and vertical-object noon shadow ratio 4.277.

Harth computed the Finglas fingerprint for latitude 53.3892° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude -6.2969° 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?

Sources and method

Location data from the GeoNames IE dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 2964303). 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. Project-date refinement reference: NREL Solar Position Algorithm.

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Frequently asked questions

What does the daylight and building orientation record for Finglas establish?

The daylight and building orientation record for Finglas establishes a reproducible discovery point at 53.3892, -6.2969 (GeoNames ID 2964303, 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 daylight and building orientation workflow for a project in Finglas?

For the daylight and building orientation record in Finglas, replace the 53.3892, -6.2969 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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