# Solar Altitude & Azimuth: Pimpri, India

> How to research solar altitude & azimuth for a specific site in Pimpri — the controlling authority, source documents, and checks to run before you rely on a number.

- Canonical: https://harth.build/resources/solar-data/solar-altitude-azimuth-pimpri-in/
- Last updated: 2026-09-02
- Data source: Location data from the [GeoNames IN dump](https://download.geonames.org/export/dump/IN.zip) (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1259652). Regulatory starting point: [Bureau of Indian Standards and the applicable state or urban local body](https://www.services.bis.gov.in/php/BIS_2.0/bisconnect/knowyourstandards/Indian_standards/isdetails/). 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. Project-date refinement reference: [NREL Solar Position Algorithm](https://midcdmz.nrel.gov/spa/).

## Key facts

| Fact | Value |
| --- | --- |
| Location reference | 18.6229, 73.8070 (GeoNames ID 1259652; replace with surveyed project coordinates) |
| Administrative area | 16 (GeoNames snapshot code; confirm the competent local jurisdiction) |
| Regulatory starting point | National Building Code of India plus state and urban-local-body rules (country-level context only; identify the competent local authority) |
| June-solstice solar-noon check | 85.2° (declination-only geometry; not an hourly obstruction model) |
| Equinox solar-noon check | 71.4° (declination-only geometry) |
| December-solstice solar-noon check | 47.9° (declination-only geometry; verify civil time and horizon) |
| Approximate daylight range | 10.9–13.1 hours (representative 21st-day geometry (December to June); excludes refraction and terrain) |

## Direct answer

For Pimpri at 18.6229, 73.8070, the declination-only solar-noon altitude is approximately 85.2° at the June solstice, 71.4° at an equinox and 47.9° 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 1259652 in administrative area 16, at 18.6229, 73.8070; replace it with the surveyed parcel point before relying on the result. As a transparent geometry check, declination-only solar-noon altitude is about 85.2° at the June solstice, 71.4° at an equinox and 47.9° at the December solstice. Representative 21st-day geometry ranges from about 10.9 hours in December to 13.1 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 solar altitude and azimuth record.

*Content and cited inputs reviewed by [Scott Barrington](https://nz.linkedin.com/in/barrington), Harth founder and architectural technology specialist · Published 2026-08-26 · Updated 2026-09-02.*

## What must be verified for Pimpri?

Pimpri is represented here at approximately **18.6229, 73.8070** 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 solar altitude and azimuth 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.

| 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 solar-angle-workflow page is a project-starting worksheet, not a design value or approval. The controlling authority and qualified professionals for the Pimpri site remain authoritative.

## Pimpri monthly solar geometry check for solar altitude & azimuth

| Representative date | Declination | Solar-noon altitude | Geometric daylight | Noon shadow / height |
| --- | ---: | ---: | ---: | ---: |
| 21 January | -20.14° | 51.24° | 11.054 h | 0.803 |
| 21 February | -11.23° | 60.15° | 11.489 h | 0.574 |
| 21 March | -0.40° | 70.97° | 11.982 h | 0.345 |
| 21 April | +11.58° | 82.96° | 12.528 h | 0.124 |
| 21 May | +20.14° | 88.48° | 12.946 h | 0.026 |
| 21 June | +23.45° | 85.17° | 13.121 h | 0.084 |
| 21 July | +20.44° | 88.18° | 12.962 h | 0.032 |
| 21 August | +11.75° | 83.13° | 12.536 h | 0.120 |
| 21 September | -0.20° | 71.18° | 11.991 h | 0.341 |
| 21 October | -11.75° | 59.62° | 11.464 h | 0.586 |
| 21 November | -20.44° | 50.94° | 11.038 h | 0.812 |
| 21 December | -23.45° | 47.93° | 10.879 h | 0.903 |

## Pimpri solar-geometry fingerprint at 18.6229, 73.8070

- **Pimpri, 21 January:** declination -20.14°, noon altitude 51.24°, zenith 38.76°, geometric daylight 11.054 hours, and vertical-object noon shadow ratio 0.803.
- **Pimpri, 21 February:** declination -11.23°, noon altitude 60.15°, zenith 29.85°, geometric daylight 11.489 hours, and vertical-object noon shadow ratio 0.574.
- **Pimpri, 21 March:** declination -0.40°, noon altitude 70.97°, zenith 19.03°, geometric daylight 11.982 hours, and vertical-object noon shadow ratio 0.345.
- **Pimpri, 21 April:** declination +11.58°, noon altitude 82.96°, zenith 7.04°, geometric daylight 12.528 hours, and vertical-object noon shadow ratio 0.124.
- **Pimpri, 21 May:** declination +20.14°, noon altitude 88.48°, zenith 1.52°, geometric daylight 12.946 hours, and vertical-object noon shadow ratio 0.026.
- **Pimpri, 21 June:** declination +23.45°, noon altitude 85.17°, zenith 4.83°, geometric daylight 13.121 hours, and vertical-object noon shadow ratio 0.084.
- **Pimpri, 21 July:** declination +20.44°, noon altitude 88.18°, zenith 1.82°, geometric daylight 12.962 hours, and vertical-object noon shadow ratio 0.032.
- **Pimpri, 21 August:** declination +11.75°, noon altitude 83.13°, zenith 6.87°, geometric daylight 12.536 hours, and vertical-object noon shadow ratio 0.120.
- **Pimpri, 21 September:** declination -0.20°, noon altitude 71.18°, zenith 18.82°, geometric daylight 11.991 hours, and vertical-object noon shadow ratio 0.341.
- **Pimpri, 21 October:** declination -11.75°, noon altitude 59.62°, zenith 30.38°, geometric daylight 11.464 hours, and vertical-object noon shadow ratio 0.586.
- **Pimpri, 21 November:** declination -20.44°, noon altitude 50.94°, zenith 39.06°, geometric daylight 11.038 hours, and vertical-object noon shadow ratio 0.812.
- **Pimpri, 21 December:** declination -23.45°, noon altitude 47.93°, zenith 42.07°, geometric daylight 10.879 hours, and vertical-object noon shadow ratio 0.903.

Harth computed the Pimpri fingerprint for latitude 18.6229° with the Cooper declination approximation, `90° - |latitude - declination|` at solar noon, centre-to-centre sunrise hour angle and `1 / tan(altitude)` shadow ratio. Longitude 73.8070° is retained for a later civil-time conversion; this screen does not perform that conversion. See [NOAA's solar calculation details](https://gml.noaa.gov/grad/solcalc/calcdetails.html). Atmospheric refraction, terrain, facade azimuth and obstructions remain outside this first-pass comparison.

## Where can you explore related guidance?

- [Explore all solar data guidance](https://harth.build/resources/solar-data.md)
- [Sun Path: Pimpri, India](https://harth.build/resources/solar-data/sun-path-pimpri-in.md)
- [Solar Shading Design: Pimpri, India](https://harth.build/resources/solar-data/solar-shading-design-pimpri-in.md)
- [Daylight & Orientation: Pimpri, India](https://harth.build/resources/solar-data/daylight-orientation-pimpri-in.md)
- [Solar Altitude & Azimuth: Pimpri-Chinchwad, India](https://harth.build/resources/solar-data/solar-altitude-azimuth-pimpri-chinchwad-in.md)
- [All solar & daylight data guidance for India](https://harth.build/resources/solar-data/india.md)
- [House Construction Cost Planning: Pimpri, India](https://harth.build/resources/construction-costs/house-construction-cost-pimpri-in.md)
- [Office Construction Cost Planning: Pimpri, India](https://harth.build/resources/construction-costs/office-construction-cost-pimpri-in.md)
- [Retail Construction Cost Planning: Pimpri, India](https://harth.build/resources/construction-costs/retail-construction-cost-pimpri-in.md)
- [School Construction Cost Planning: Pimpri, India](https://harth.build/resources/construction-costs/school-construction-cost-pimpri-in.md)

## Sources and method

Location data from the [GeoNames IN dump](https://download.geonames.org/export/dump/IN.zip) (CC BY 4.0, snapshot 2026-08-31, GeoNames ID 1259652). Regulatory starting point: [Bureau of Indian Standards and the applicable state or urban local body](https://www.services.bis.gov.in/php/BIS_2.0/bisconnect/knowyourstandards/Indian_standards/isdetails/). 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. Project-date refinement reference: [NREL Solar Position Algorithm](https://midcdmz.nrel.gov/spa/).

### Source links

- [download.geonames.org](https://download.geonames.org/export/dump/IN.zip)

- [services.bis.gov.in](https://www.services.bis.gov.in/php/BIS_2.0/bisconnect/knowyourstandards/Indian_standards/isdetails/)

- [gml.noaa.gov](https://gml.noaa.gov/grad/solcalc/calcdetails.html)

- [midcdmz.nrel.gov](https://midcdmz.nrel.gov/spa/)

## Frequently asked questions

### What does the solar altitude and azimuth record for Pimpri establish?

The solar altitude and azimuth record for Pimpri establishes a reproducible discovery point at 18.6229, 73.8070 (GeoNames ID 1259652, administrative area 16) and a India source path. It does not establish a final project value, approval or parcel decision.

### What must be replaced before using this solar altitude and azimuth workflow for a project in Pimpri?

For the solar altitude and azimuth record in Pimpri, replace the 18.6229, 73.8070 city reference with the surveyed site or parcel, identify the competent local authority, and verify the current documents under National Building Code of India plus state and urban-local-body rules. Record the edition, retrieval date, units, assumptions and named checker before relying on the result.

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