Sun Path: Athlone, South Africa

Direct answer

For Athlone at -33.9672, 18.5021, the declination-only solar-noon altitude is approximately 32.6° at the June solstice, 56.0° at an equinox and 79.5° 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 3370356 in administrative area 11, at -33.9672, 18.5021; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 32.6° at the June solstice, 56.0° at an equinox and 79.5° at the December solstice. Representative 21st-day geometry ranges from about 9.7 hours in June to 14.3 hours in December; 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 Athlone?

Athlone is represented here at approximately -33.9672, 18.5021 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?

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.

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 Athlone 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.

Athlone monthly solar geometry check for sun path

Athlone solar-geometry fingerprint at -33.9672, 18.5021

• Athlone, 21 January: declination -20.14°, noon altitude 76.17°, zenith 13.83°, geometric daylight 13.907 hours, and vertical-object noon shadow ratio 0.246.
• Athlone, 21 February: declination -11.23°, noon altitude 67.26°, zenith 22.74°, geometric daylight 13.025 hours, and vertical-object noon shadow ratio 0.419.
• Athlone, 21 March: declination -0.40°, noon altitude 56.44°, zenith 33.56°, geometric daylight 12.036 hours, and vertical-object noon shadow ratio 0.663.
• Athlone, 21 April: declination +11.58°, noon altitude 44.45°, zenith 45.55°, geometric daylight 10.942 hours, and vertical-object noon shadow ratio 1.019.
• Athlone, 21 May: declination +20.14°, noon altitude 35.89°, zenith 54.11°, geometric daylight 10.093 hours, and vertical-object noon shadow ratio 1.382.
• Athlone, 21 June: declination +23.45°, noon altitude 32.58°, zenith 57.42°, geometric daylight 9.735 hours, and vertical-object noon shadow ratio 1.565.
• Athlone, 21 July: declination +20.44°, noon altitude 35.59°, zenith 54.41°, geometric daylight 10.061 hours, and vertical-object noon shadow ratio 1.397.
• Athlone, 21 August: declination +11.75°, noon altitude 44.28°, zenith 45.72°, geometric daylight 10.926 hours, and vertical-object noon shadow ratio 1.026.
• Athlone, 21 September: declination -0.20°, noon altitude 56.23°, zenith 33.77°, geometric daylight 12.018 hours, and vertical-object noon shadow ratio 0.669.
• Athlone, 21 October: declination -11.75°, noon altitude 67.79°, zenith 22.21°, geometric daylight 13.074 hours, and vertical-object noon shadow ratio 0.408.
• Athlone, 21 November: declination -20.44°, noon altitude 76.47°, zenith 13.53°, geometric daylight 13.939 hours, and vertical-object noon shadow ratio 0.241.
• Athlone, 21 December: declination -23.45°, noon altitude 79.48°, zenith 10.52°, geometric daylight 14.265 hours, and vertical-object noon shadow ratio 0.186.

Harth computed the Athlone fingerprint for latitude -33.9672° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 18.5021° 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: Cape Town, South Africa
• Sun Path: Somerset West, South Africa
• Sun Path: Paarl, South Africa
• Sun Path: George, South Africa
• All solar & daylight data guidance for South Africa
• Climate Design Data: Athlone, South Africa

Sources and method

Location data from the GeoNames ZA dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 3370356). Regulatory starting point: South African Bureau of Standards and the 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.

Source links

• download.geonames.org

• sabs.co.za

• gml.noaa.gov