Sun Path: Johor Bahru, Malaysia

Direct answer

For Johor Bahru at 1.4655, 103.7578, the declination-only solar-noon altitude is approximately 68.0° at the June solstice, 88.5° at an equinox and 65.1° 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 1732752 in administrative area 01, at 1.4655, 103.7578; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 68.0° at the June solstice, 88.5° at an equinox and 65.1° at the December solstice. Representative 21st-day geometry ranges from about 11.9 hours in December to 12.1 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.

Content and cited inputs reviewed by Harth team · Published 2026-08-26 · Updated 2026-08-31.

What must be verified for Johor Bahru?

Johor Bahru is represented here at approximately 1.4655, 103.7578 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 Johor Bahru site remain authoritative.

Johor Bahru monthly solar geometry check for sun path

Month-by-month geometry interpretation

• 21 January: approximate solar-noon altitude 68.4° (zenith angle 21.6°) and 11.9 hours of geometric daylight. That is 0.0 hours longer than the preceding representative date in this annual sequence.
• 21 February: approximate solar-noon altitude 77.3° (zenith angle 12.7°) and 12.0 hours of geometric daylight. That is 0.0 hours longer than the preceding representative date in this annual sequence.
• 21 March: approximate solar-noon altitude 88.1° (zenith angle 1.9°) and 12.0 hours of geometric daylight. That is 0.0 hours longer than the preceding representative date in this annual sequence.
• 21 April: approximate solar-noon altitude 79.9° (zenith angle 10.1°) and 12.0 hours of geometric daylight. That is 0.0 hours longer than the preceding representative date in this annual sequence.
• 21 May: approximate solar-noon altitude 71.3° (zenith angle 18.7°) and 12.1 hours of geometric daylight. That is 0.0 hours longer than the preceding representative date in this annual sequence.
• 21 June: approximate solar-noon altitude 68.0° (zenith angle 22.0°) and 12.1 hours of geometric daylight. That is 0.0 hours longer than the preceding representative date in this annual sequence.
• 21 July: approximate solar-noon altitude 71.0° (zenith angle 19.0°) and 12.1 hours of geometric daylight. That is 0.0 hours shorter than the preceding representative date in this annual sequence.
• 21 August: approximate solar-noon altitude 79.7° (zenith angle 10.3°) and 12.0 hours of geometric daylight. That is 0.0 hours shorter than the preceding representative date in this annual sequence.
• 21 September: approximate solar-noon altitude 88.3° (zenith angle 1.7°) and 12.0 hours of geometric daylight. That is 0.0 hours shorter than the preceding representative date in this annual sequence.
• 21 October: approximate solar-noon altitude 76.8° (zenith angle 13.2°) and 12.0 hours of geometric daylight. That is 0.0 hours shorter than the preceding representative date in this annual sequence.
• 21 November: approximate solar-noon altitude 68.1° (zenith angle 21.9°) and 11.9 hours of geometric daylight. That is 0.0 hours shorter than the preceding representative date in this annual sequence.
• 21 December: approximate solar-noon altitude 65.1° (zenith angle 24.9°) and 11.9 hours of geometric daylight. That is 0.0 hours shorter than the preceding representative date in this annual sequence.

Harth calculation for latitude 1.4655°: Cooper declination approximation, 90° - |latitude - declination| at solar noon, and centre-to-centre sunrise hour angle. See NOAA's solar calculation details for fuller method context. This screening table excludes equation-of-time/civil-time conversion, atmospheric refraction, terrain, facade azimuth and obstructions; it is not an hourly shading result.

Where can you explore related guidance?

• Explore all solar data guidance
• Sun Path: Muar, Malaysia
• Sun Path: Malacca, Malaysia
• Sun Path: Kluang, Malaysia
• All solar & daylight data guidance for Malaysia
• Climate Design Data: Johor Bahru, Malaysia
• House Construction Cost Planning: Johor Bahru, Malaysia
• Office Construction Cost Planning: Johor Bahru, Malaysia
• Retail Construction Cost Planning: Johor Bahru, Malaysia

Sources and method

Location data from the GeoNames MY dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1732752). Regulatory starting point: the applicable state and 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

• jkt.kpkt.gov.my

• gml.noaa.gov