Solar Path Tracker

Solar guide · Orientation matrix

East vs West-Facing Homes in Australia: Reading the Solar Difference

Use solar azimuth and altitude to compare morning east-facing exposure with afternoon west-facing exposure in an Australian context.

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Choosing when to inspect an east- or west-facing home? Visit the eastern openings in the morning and the western openings in the afternoon, then repeat the calculation for winter and summer. Check the actual window or garden orientation: the direction a street entrance faces does not describe every part of a property.

The Darwin, Brisbane and Hobart matrix below turns that first step into specific 08:00 and 16:00 checks. Each row gives a calculated solar bearing and altitude, not a room-temperature prediction or proof that sunlight reaches a window.

Translate orientation into a bearing range

A perfectly east-facing wall points toward 90°; a perfectly west-facing wall points toward 270°. Real walls may face north-east, south-east, north-west, or south-west, which shifts the hours when direct light reaches them. Use the wall’s true bearing instead of relying only on a sales description or street direction.

The Sun’s bearing is only one part of the test. A low morning or afternoon altitude can send light deep beneath a horizontal overhang, whereas a high midday altitude is more easily excluded by that same geometry.

Compare equal distances from noon

An 08:00 versus 16:00 comparison is a helpful first pass because the samples sit on opposite sides of midday. They are not guaranteed to be perfect mirror images: the equation of time, local longitude within a timezone, and the chosen date influence the path.

For a real inspection, repeat the calculation at the expected occupancy times. A bedroom, kitchen, office, and outdoor deck can each make a different orientation trade-off.

The June and December dates are fixed seasonal references, not the exact local dates of the solstices.

Orientation matrix

Australian east–west facade bearing matrix

Darwin, Brisbane, and Hobart are sampled at 08:00 and 16:00 on both seasonal reference dates. The matrix reports solar geometry only: it identifies whether the bearing lies in the east-facing or west-facing half-sky and makes no claim about room temperature, cooling energy, or comfort.

Geometry rule: an east-facing vertical plane can face bearings from 0° to 180°; a west-facing plane can face bearings from 180° to 360°. Actual direct light still depends on facade rotation, obstacles, opening depth, and solar altitude.
East and west half-skies with calculated Brisbane winter bearingsTrue north is up. An ideal east-facing plane looks toward the right half of the compass, and a west-facing plane toward the left. Lines point from the observation point toward the Sun at 08:00 and 16:00 on 21 June 2026. These are bearings, not shaded areas.N · 0°E · 90°S · 180°W · 270°08:00 · 53.1°16:00 · 303.9°Bearings toward the Sun · true north

Read direction before judging exposure

This original compass sketch plots the matrix’s Brisbane winter 08:00 and 16:00 bearings. The right half is the east-facing half-sky; the left half is west-facing. The coloured halves show orientation only.

Find a row’s bearing on this compass, then read its altitude. A bearing in the correct half-sky is only a possible direct-light direction. The actual wall angle, eaves, window recesses and nearby trees still need checking on site.

Darwin, Brisbane, and Hobart seasonal facade orientation matrix
CitySeasonLocal timeSolar bearingAltitudeGeometric exposure
DarwinAustralia/DarwinWinter reference2026-06-21Reproduce 08:00 →62.8° North-east10.9°East-facing half-sky
DarwinAustralia/DarwinWinter reference2026-06-21Reproduce 16:00 →307.5° North-west31.0°West-facing half-sky
DarwinAustralia/DarwinSummer reference2026-12-21Reproduce 08:00 →110.5° East22.1°East-facing half-sky
DarwinAustralia/DarwinSummer reference2026-12-21Reproduce 16:00 →249.5° West42.5°West-facing half-sky
BrisbaneAustralia/BrisbaneWinter reference2026-06-21Reproduce 08:00 →53.1° North-east14.8°East-facing half-sky
BrisbaneAustralia/BrisbaneWinter reference2026-06-21Reproduce 16:00 →303.9° North-west11.1°West-facing half-sky
BrisbaneAustralia/BrisbaneSummer reference2026-12-21Reproduce 08:00 →98.8° East39.3°East-facing half-sky
BrisbaneAustralia/BrisbaneSummer reference2026-12-21Reproduce 16:00 →258.7° West33.1°West-facing half-sky
HobartAustralia/HobartWinter reference2026-06-21Reproduce 08:00 →55.0° North-east1.9°East-facing half-sky
HobartAustralia/HobartWinter reference2026-06-21Reproduce 16:00 →309.5° North-west5.6°West-facing half-sky
HobartAustralia/HobartSummer reference2026-12-21Reproduce 08:00 →99.7° East24.8°East-facing half-sky
HobartAustralia/HobartSummer reference2026-12-21Reproduce 16:00 →285.0° West49.8°West-facing half-sky

Download the evidence dataset

Darwin, Brisbane, and Hobart winter/summer bearings at 08:00 and 16:00 for geometric facade checks. The UTF-8 CSV uses a fixed column order and contains calculated values only.

Read a matrix row in four steps

Start with the city and local date, then open that row in the angle calculator. The timezone is part of the input: Hobart uses daylight saving in December, while Brisbane and Darwin do not. Equal local clock times across cities are not equal solar times.

Check altitude first. At or below 0°, a direct-sun exposure label would be misleading. For positive altitude, locate the azimuth on the compass: 0–180° is the east-facing half-sky and 180–360° is the west-facing half-sky. Bearings exactly north or south are parallel to an ideal east/west plane.

Compare the other season at the same city and time, then check the actual skyline along that bearing. A low angle may meet a fence or neighbouring building before reaching the opening. Record that observation separately; it is not an output of this matrix.

A property-inspection workflow

Confirm the orientation with a surveyed plan, reliable map, or corrected compass. Enter the actual coordinates and inspection date, then note bearings for the rooms and outdoor spaces that matter. At the property, check the horizon for trees, slopes, towers, balconies, and adjacent buildings.

Record observations at more than one time if sunlight is a major decision factor. A single midday visit can miss both early eastern light and the late western exposure that affects afternoon use.

  • Use the actual facade bearing, not only the address-facing direction.
  • Check summer and winter reference dates.
  • Treat comfort and energy performance as separate assessments requiring building data.

Responsible use

Practical uses and model limits

Useful for

  • • Preparing questions before a home inspection or rental viewing.
  • • Comparing likely morning light in bedrooms with afternoon light in living areas.
  • • Planning where external shade or vegetation observations need the most attention.

Do not overlook

  • • Solar geometry alone cannot predict indoor temperature, glare, cooling load, or occupant comfort.
  • • A bearing in an east- or west-facing half of the sky does not prove that sunlight reaches a window. Check the actual window orientation against true north; a magnetic compass may need a declination correction.
  • • Local terrain, neighbouring development, trees, curtains, glass, and external shading can dominate the visible result.
Calculation methods and general model limits

Sources and reproducibility

Evidence and calculation sources

  • NREL Solar Position Algorithm report

    Independent description of solar-position geometry; the facade labels here are site-authored interpretations of bearing only.

  • SunCalc

    Solar position and astronomical event calculations used by this site.

  • Luxon

    IANA timezone-aware conversion between the selected local time and UTC.

  • Solar Path Tracker methodology

    Definitions, angle normalization, polar handling, precision, and model limits.