Sun Path: Iloilo, Philippines

Direct answer

For Iloilo at 10.6969, 122.5644, the declination-only solar-noon altitude is approximately 77.3° at the June solstice, 79.3° at an equinox and 55.9° 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 1711005 in administrative area 06, at 10.6969, 122.5644; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 77.3° at the June solstice, 79.3° at an equinox and 55.9° at the December solstice. Representative 21st-day geometry ranges from about 11.4 hours in December to 12.6 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 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 Iloilo?

Iloilo is represented here at approximately 10.6969, 122.5644 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 Iloilo 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.

Iloilo monthly solar geometry check for sun path

Iloilo solar-geometry fingerprint at 10.6969, 122.5644

• Iloilo, 21 January: declination -20.14°, noon altitude 59.17°, zenith 30.83°, geometric daylight 11.470 hours, and vertical-object noon shadow ratio 0.597.
• Iloilo, 21 February: declination -11.23°, noon altitude 68.08°, zenith 21.92°, geometric daylight 11.714 hours, and vertical-object noon shadow ratio 0.402.
• Iloilo, 21 March: declination -0.40°, noon altitude 78.90°, zenith 11.10°, geometric daylight 11.990 hours, and vertical-object noon shadow ratio 0.196.
• Iloilo, 21 April: declination +11.58°, noon altitude 89.12°, zenith 0.88°, geometric daylight 12.296 hours, and vertical-object noon shadow ratio 0.015.
• Iloilo, 21 May: declination +20.14°, noon altitude 80.56°, zenith 9.44°, geometric daylight 12.530 hours, and vertical-object noon shadow ratio 0.166.
• Iloilo, 21 June: declination +23.45°, noon altitude 77.25°, zenith 12.75°, geometric daylight 12.627 hours, and vertical-object noon shadow ratio 0.226.
• Iloilo, 21 July: declination +20.44°, noon altitude 80.26°, zenith 9.74°, geometric daylight 12.538 hours, and vertical-object noon shadow ratio 0.172.
• Iloilo, 21 August: declination +11.75°, noon altitude 88.94°, zenith 1.06°, geometric daylight 12.300 hours, and vertical-object noon shadow ratio 0.018.
• Iloilo, 21 September: declination -0.20°, noon altitude 79.10°, zenith 10.90°, geometric daylight 11.995 hours, and vertical-object noon shadow ratio 0.193.
• Iloilo, 21 October: declination -11.75°, noon altitude 67.55°, zenith 22.45°, geometric daylight 11.700 hours, and vertical-object noon shadow ratio 0.413.
• Iloilo, 21 November: declination -20.44°, noon altitude 58.86°, zenith 31.14°, geometric daylight 11.462 hours, and vertical-object noon shadow ratio 0.604.
• Iloilo, 21 December: declination -23.45°, noon altitude 55.85°, zenith 34.15°, geometric daylight 11.373 hours, and vertical-object noon shadow ratio 0.678.

Harth computed the Iloilo fingerprint for latitude 10.6969° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 122.5644° 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: Bacolod City, Philippines
• Sun Path: Mansilingan, Philippines
• Sun Path: Cebu City, Philippines
• Sun Path: Mandaue City, Philippines
• All solar & daylight data guidance for Philippines
• Climate Design Data: Iloilo, Philippines

Sources and method

Location data from the GeoNames PH dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1711005). 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