SHADELINE

SUN & SHADOW STUDIO

SKAI-LINE / 014

ARCHITECTURAL GROUND STUDY

Courtyard study

2026-03-21 · UTC+08:00 · 1.3521° N, 103.8198° E

Temporary browser-local study. Nothing is uploaded or autosaved. Download JSON to keep your work.

Synthetic courtyard loaded. Change the time, edit building dimensions, or run a day study.
01 / GROUND PLAN32 × 24 m · TRUE NORTH UP
Courtyard study · 09:00 local ground-shadow planTrue north up; dimensions in metres. Dark polygons are building footprints; blue polygons are idealized ground shadows. Numbered yellow markers match the sample-point table. Building footprints are excluded from open-ground shade percentages. North blockWest wingStudioABC1Courtyard centre · sun2South entrance · sun3Possible bench · sun32 m24 mN5 mSW origin (0, 0)
Building footprintGround shadowSample point

LOCAL CLOCK TIME

09:00
00:0012:0024:00
Open ground shaded19.3%120.2 m² of 622.0 m²
Solar elevation27.0°Geometric, before refraction
Solar azimuth90.5°Clockwise from true north

02 / TIME STUDY

Follow the shade through the day

08:00–18:00 local · base interval 30 min · finer interval 15 min

Run both sampling resolutions to estimate shaded and sunlit hours. Changing study settings or geometry clears these results.

03 / NAMED LOCATIONS

What happens at this spot?

Point hours use the day study’s finer samples. Building boundaries count as occupied; nighttime is not counted as shade. “—” means unavailable or not an outdoor point.
Point · metres E / NNow · 09:00Shade hoursSun hoursShade differenceEdit
1Courtyard centre16.0 / 11.0Direct sun——— h
2South entrance16.0 / 3.0Direct sun——— h
3Possible bench9.0 / 13.0Direct sun——— h

MODEL NOTES

A design question, not a planning verdict

Sun direction follows NOAA / Meeus solar equations using your entered location, date and signed UTC offset. Daylight saving is not inferred. Heights and positions are assumed, not surveyed; the example is synthetic. The NOAA calculator is no longer actively maintained.

Ground shadows are the swept footprints of rectangular building prisms, clipped to the site. Union areas remove overlaps. Very long projections are shortened only beyond the greatest footprint-to-site distance needed for clipping. This geometric safeguard does not remove low-sun uncertainty.

Coarse and finer midpoint samples can both miss brief transitions. Reduce the base interval and inspect relevant times before drawing conclusions. No result certifies sunlight access, habitability, planning compliance or safe design.

NOAA calculation details ↗ · Why robust geometric predicates matter ↗

Keep the drawing

Download the current plan as SVG. Save study JSON to reopen editable inputs; the report includes both inputs and calculated samples.

Study notes

Synthetic massing at a Singapore location. Dimensions are illustrative, not a survey.

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