Sun Path: Iligan City, Philippines

Direct answer

For Iligan City at 8.2500, 124.4000, the declination-only solar-noon altitude is approximately 74.8° at the June solstice, 81.8° at an equinox and 58.3° 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 1711082 in administrative area 12, at 8.2500, 124.4000; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 74.8° at the June solstice, 81.8° at an equinox and 58.3° at the December solstice. Representative 21st-day geometry ranges from about 11.5 hours in December to 12.5 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 Iligan City?

Iligan City is represented here at approximately 8.2500, 124.4000 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 Iligan City 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.

Iligan City monthly solar geometry check for sun path

Iligan City solar-geometry fingerprint at 8.2500, 124.4000

• Iligan City, 21 January: declination -20.14°, noon altitude 61.61°, zenith 28.39°, geometric daylight 11.594 hours, and vertical-object noon shadow ratio 0.540.
• Iligan City, 21 February: declination -11.23°, noon altitude 70.52°, zenith 19.48°, geometric daylight 11.780 hours, and vertical-object noon shadow ratio 0.354.
• Iligan City, 21 March: declination -0.40°, noon altitude 81.35°, zenith 8.65°, geometric daylight 11.992 hours, and vertical-object noon shadow ratio 0.152.
• Iligan City, 21 April: declination +11.58°, noon altitude 86.67°, zenith 3.33°, geometric daylight 12.227 hours, and vertical-object noon shadow ratio 0.058.
• Iligan City, 21 May: declination +20.14°, noon altitude 78.11°, zenith 11.89°, geometric daylight 12.406 hours, and vertical-object noon shadow ratio 0.211.
• Iligan City, 21 June: declination +23.45°, noon altitude 74.80°, zenith 15.20°, geometric daylight 12.481 hours, and vertical-object noon shadow ratio 0.272.
• Iligan City, 21 July: declination +20.44°, noon altitude 77.81°, zenith 12.19°, geometric daylight 12.413 hours, and vertical-object noon shadow ratio 0.216.
• Iligan City, 21 August: declination +11.75°, noon altitude 86.50°, zenith 3.50°, geometric daylight 12.231 hours, and vertical-object noon shadow ratio 0.061.
• Iligan City, 21 September: declination -0.20°, noon altitude 81.55°, zenith 8.45°, geometric daylight 11.996 hours, and vertical-object noon shadow ratio 0.149.
• Iligan City, 21 October: declination -11.75°, noon altitude 70.00°, zenith 20.00°, geometric daylight 11.769 hours, and vertical-object noon shadow ratio 0.364.
• Iligan City, 21 November: declination -20.44°, noon altitude 61.31°, zenith 28.69°, geometric daylight 11.587 hours, and vertical-object noon shadow ratio 0.547.
• Iligan City, 21 December: declination -23.45°, noon altitude 58.30°, zenith 31.70°, geometric daylight 11.519 hours, and vertical-object noon shadow ratio 0.618.

Harth computed the Iligan City fingerprint for latitude 8.2500° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 124.4000° 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: Iligan, Philippines
• Sun Path: Cagayan de Oro, Philippines
• Sun Path: Cotabato, Philippines
• Sun Path: Budta, Philippines
• All solar & daylight data guidance for Philippines

Sources and method

Location data from the GeoNames PH dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1711082). Regulatory starting point: Department of Public Works and Highways and the local Office of the Building Official. 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

• dpwh.gov.ph

• gml.noaa.gov