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Updated 2026-09-02

Solar & Daylight Data

Daylight & Orientation: Ar Rumaylah, UAE

How to research daylight & orientation for a specific site in Ar Rumaylah — 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 AE dump](https://download.geonames.org/export/dump/AE.zip) (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 8475866). Regulatory starting point: [UAE Government overview of local building authorities](https://u.ae/en/information-and-services/justice-safety-and-the-law/building-safety). 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 Ar Rumaylah at 25.4034, 55.4334, the declination-only solar-noon altitude is approximately 88.0° at the June solstice, 64.6° at an equinox and 41.2° 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 8475866 in administrative area 02, at 25.4034, 55.4334; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 88.0° at the June solstice, 64.6° at an equinox and 41.2° at the December solstice. Representative 21st-day geometry ranges from about 10.4 hours in December to 13.6 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 Ar Rumaylah?

Ar Rumaylah is represented here at approximately 25.4034, 55.4334 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 Ar Rumaylah site remain authoritative.

Ar Rumaylah monthly solar geometry check for daylight & orientation

Representative dateDeclinationSolar-noon altitudeGeometric daylightNoon shadow / height
21 January-20.14°44.46°10.663 h1.019
21 February-11.23°53.37°11.279 h0.743
21 March-0.40°64.19°11.974 h0.484
21 April+11.58°76.18°12.745 h0.246
21 May+20.14°84.73°13.337 h0.092
21 June+23.45°88.05°13.585 h0.034
21 July+20.44°85.04°13.359 h0.087
21 August+11.75°76.35°12.756 h0.243
21 September-0.20°64.39°11.987 h0.479
21 October-11.75°52.84°11.244 h0.758
21 November-20.44°44.16°10.641 h1.030
21 December-23.45°41.15°10.415 h1.144

Ar Rumaylah solar-geometry fingerprint at 25.4034, 55.4334

  • Ar Rumaylah, 21 January: declination -20.14°, noon altitude 44.46°, zenith 45.54°, geometric daylight 10.663 hours, and vertical-object noon shadow ratio 1.019.
  • Ar Rumaylah, 21 February: declination -11.23°, noon altitude 53.37°, zenith 36.63°, geometric daylight 11.279 hours, and vertical-object noon shadow ratio 0.743.
  • Ar Rumaylah, 21 March: declination -0.40°, noon altitude 64.19°, zenith 25.81°, geometric daylight 11.974 hours, and vertical-object noon shadow ratio 0.484.
  • Ar Rumaylah, 21 April: declination +11.58°, noon altitude 76.18°, zenith 13.82°, geometric daylight 12.745 hours, and vertical-object noon shadow ratio 0.246.
  • Ar Rumaylah, 21 May: declination +20.14°, noon altitude 84.73°, zenith 5.27°, geometric daylight 13.337 hours, and vertical-object noon shadow ratio 0.092.
  • Ar Rumaylah, 21 June: declination +23.45°, noon altitude 88.05°, zenith 1.95°, geometric daylight 13.585 hours, and vertical-object noon shadow ratio 0.034.
  • Ar Rumaylah, 21 July: declination +20.44°, noon altitude 85.04°, zenith 4.96°, geometric daylight 13.359 hours, and vertical-object noon shadow ratio 0.087.
  • Ar Rumaylah, 21 August: declination +11.75°, noon altitude 76.35°, zenith 13.65°, geometric daylight 12.756 hours, and vertical-object noon shadow ratio 0.243.
  • Ar Rumaylah, 21 September: declination -0.20°, noon altitude 64.39°, zenith 25.61°, geometric daylight 11.987 hours, and vertical-object noon shadow ratio 0.479.
  • Ar Rumaylah, 21 October: declination -11.75°, noon altitude 52.84°, zenith 37.16°, geometric daylight 11.244 hours, and vertical-object noon shadow ratio 0.758.
  • Ar Rumaylah, 21 November: declination -20.44°, noon altitude 44.16°, zenith 45.84°, geometric daylight 10.641 hours, and vertical-object noon shadow ratio 1.030.
  • Ar Rumaylah, 21 December: declination -23.45°, noon altitude 41.15°, zenith 48.85°, geometric daylight 10.415 hours, and vertical-object noon shadow ratio 1.144.

Harth computed the Ar Rumaylah fingerprint for latitude 25.4034° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 55.4334° 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 AE dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 8475866). Regulatory starting point: UAE Government overview of local building authorities. 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 Ar Rumaylah establish?

The daylight and building orientation record for Ar Rumaylah establishes a reproducible discovery point at 25.4034, 55.4334 (GeoNames ID 8475866, administrative area 02) and a United Arab Emirates 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 Ar Rumaylah?

For the daylight and building orientation record in Ar Rumaylah, replace the 25.4034, 55.4334 city reference with the surveyed site or parcel, identify the competent local authority, and verify the current documents under emirate- and municipality-specific building regulations and permit systems. Record the edition, retrieval date, units, assumptions and named checker before relying on the result.

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