Solar & Daylight Data
Sun Path: Eldoret, Kenya
How to research sun path for a specific site in Eldoret — the controlling authority, source documents, and checks to run before you rely on a number.
Last updated August 31, 2026 · Location data from the [GeoNames KE dump](https://download.geonames.org/export/dump/KE.zip) (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 198629). Regulatory starting point: [National Construction Authority and the applicable county government](https://www.nca.go.ke/). 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.
Direct answer
For Eldoret at 0.5204, 35.2699, the declination-only solar-noon altitude is approximately 67.1° at the June solstice, 89.5° at an equinox and 66.0° 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 198629 in administrative area 52, at 0.5204, 35.2699; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 67.1° at the June solstice, 89.5° at an equinox and 66.0° at the December solstice. Representative 21st-day geometry ranges from about 12.0 hours in December to 12.0 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 Eldoret?
Eldoret is represented here at approximately 0.5204, 35.2699 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?
- Fix the surveyed site and local time basis.
- Select an authoritative weather source or a named solar-position algorithm.
- Record period, percentile or scenario and units.
- Test sensitivity to elevation, exposure, urban form and horizon.
- Save the source file, retrieval date and checker in the model record.
| Input | Project-specific evidence | QA question |
|---|---|---|
| Site | surveyed coordinates, elevation and horizon | Does the point represent the building? |
| Weather/solar method | named dataset, algorithm, period and time basis | Are station, time zone and units explicit? |
| Design scenario | current and future scenario agreed by the team | Is an average being mistaken for an extreme? |
| Compliance | adopted local document and edition | Was applicability confirmed with the authority? |
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 Eldoret site remain authoritative.
Eldoret monthly solar geometry check for sun path
| Representative date | Declination | Solar-noon altitude | Geometric daylight | Noon shadow / height |
|---|---|---|---|---|
| 21 January | -20.14° | 69.34° | 11.975 h | 0.377 |
| 21 February | -11.23° | 78.25° | 11.986 h | 0.208 |
| 21 March | -0.40° | 89.08° | 12.000 h | 0.016 |
| 21 April | +11.58° | 78.94° | 12.014 h | 0.195 |
| 21 May | +20.14° | 70.38° | 12.025 h | 0.356 |
| 21 June | +23.45° | 67.07° | 12.030 h | 0.423 |
| 21 July | +20.44° | 70.08° | 12.026 h | 0.362 |
| 21 August | +11.75° | 78.77° | 12.014 h | 0.199 |
| 21 September | -0.20° | 89.28° | 12.000 h | 0.013 |
| 21 October | -11.75° | 77.73° | 11.986 h | 0.218 |
| 21 November | -20.44° | 69.04° | 11.974 h | 0.383 |
| 21 December | -23.45° | 66.03° | 11.970 h | 0.445 |
Eldoret solar-geometry fingerprint at 0.5204, 35.2699
- Eldoret, 21 January: declination -20.14°, noon altitude 69.34°, zenith 20.66°, geometric daylight 11.975 hours, and vertical-object noon shadow ratio 0.377.
- Eldoret, 21 February: declination -11.23°, noon altitude 78.25°, zenith 11.75°, geometric daylight 11.986 hours, and vertical-object noon shadow ratio 0.208.
- Eldoret, 21 March: declination -0.40°, noon altitude 89.08°, zenith 0.92°, geometric daylight 12.000 hours, and vertical-object noon shadow ratio 0.016.
- Eldoret, 21 April: declination +11.58°, noon altitude 78.94°, zenith 11.06°, geometric daylight 12.014 hours, and vertical-object noon shadow ratio 0.195.
- Eldoret, 21 May: declination +20.14°, noon altitude 70.38°, zenith 19.62°, geometric daylight 12.025 hours, and vertical-object noon shadow ratio 0.356.
- Eldoret, 21 June: declination +23.45°, noon altitude 67.07°, zenith 22.93°, geometric daylight 12.030 hours, and vertical-object noon shadow ratio 0.423.
- Eldoret, 21 July: declination +20.44°, noon altitude 70.08°, zenith 19.92°, geometric daylight 12.026 hours, and vertical-object noon shadow ratio 0.362.
- Eldoret, 21 August: declination +11.75°, noon altitude 78.77°, zenith 11.23°, geometric daylight 12.014 hours, and vertical-object noon shadow ratio 0.199.
- Eldoret, 21 September: declination -0.20°, noon altitude 89.28°, zenith 0.72°, geometric daylight 12.000 hours, and vertical-object noon shadow ratio 0.013.
- Eldoret, 21 October: declination -11.75°, noon altitude 77.73°, zenith 12.27°, geometric daylight 11.986 hours, and vertical-object noon shadow ratio 0.218.
- Eldoret, 21 November: declination -20.44°, noon altitude 69.04°, zenith 20.96°, geometric daylight 11.974 hours, and vertical-object noon shadow ratio 0.383.
- Eldoret, 21 December: declination -23.45°, noon altitude 66.03°, zenith 23.97°, geometric daylight 11.970 hours, and vertical-object noon shadow ratio 0.445.
Harth computed the Eldoret fingerprint for latitude 0.5204° with the Cooper declination approximation, 90° - |latitude - declination| at solar noon, centre-to-centre sunrise hour angle and 1 / tan(altitude) shadow ratio. Longitude 35.2699° 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
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- Sun Path: Bungoma, Kenya
- Sun Path: Khwisero, Kenya
- All solar & daylight data guidance for Kenya
- Climate Design Data: Eldoret, Kenya
Sources and method
Location data from the GeoNames KE dump (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 198629). Regulatory starting point: National Construction Authority and the applicable county government. 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
Frequently asked questions
What does the sun path record for Eldoret establish?
The sun path record for Eldoret establishes a reproducible discovery point at 0.5204, 35.2699 (GeoNames ID 198629, administrative area 52) and a Kenya source path. It does not establish a final project value, approval or parcel decision.
What must be replaced before using this sun path workflow for a project in Eldoret?
For the sun path record in Eldoret, replace the 0.5204, 35.2699 city reference with the surveyed site or parcel, identify the competent local authority, and verify the current documents under National Building Code and county development-control requirements. Record the edition, retrieval date, units, assumptions and named checker before relying on the result.
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