Solar & Daylight Data
Sun Path & Solar Angles for Boston, MA
Calculated solar-noon angles and a first-pass fixed-shading worksheet for Boston, MA, using transparent solar geometry rather than an unexplained chart.
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Last updated August 17, 2026 · Original calculation using latitude 42.3601° N and declinations +23.44°, 0°, and -23.44°. Formula: altitude = 90° - |latitude - declination|. Time zone: America/New_York. Verify occupied-hour positions with the NOAA Solar Calculator; values omit refraction, equation of time, terrain, obstructions, and facade azimuth.
Direct answer
Calculated solar-noon angles and a first-pass fixed-shading worksheet for Boston, MA, using transparent solar geometry rather than an unexplained chart. A key reference is latitude: 42.3601° N; check the cited source, edition, units, and applicability before using it for design, compliance, procurement, or approval. Latitude is 42.3601° N; Boston, MA. June solstice noon is 71.1°; south at solar noon. Equinox noon is 47.6°; geometric solar noon. Projection ratio = 1 / tan(solar altitude). Multiply the ratio by the vertical distance the noon shadow must cover. Use this only as a hand check before a full-year study. Read the values with the cited source, edition or observation period, units and applicability; replace illustrative inputs with current project evidence before design, procurement or approval use.
Content and cited inputs reviewed by Scott Barrington, Harth founder and architectural technology specialist · Published 2026-08-17 · Updated 2026-08-17.
Which solar conditions control the result?
| Date | Declination | Altitude | Projection / vertical shade distance |
|---|---|---|---|
| June solstice | +23.44° | 71.08° | 0.343 |
| Equinox | 0° | 47.64° | 0.912 |
| December solstice | -23.44° | 24.20° | 2.225 |
Projection ratio = 1 / tan(solar altitude). Multiply the ratio by the vertical distance the noon shadow must cover. Use this only as a hand check before a full-year study.
Boston, MA shading record
Record facade azimuth, window head and sill, overhang height, required shaded dates and hours, coordinates (42.3601° N), time zone (America/New_York), calculation method, surrounding obstructions, reviewer and date. Compare the full model against the three noon ratios above and retain screenshots of the critical summer and shoulder-season hours. Verify hourly positions with the NOAA Solar Calculator.
Where can you explore related guidance?
- Explore all solar data guidance
- Understanding Sun-Path Diagrams
- Solar Altitude and Azimuth Explained
- Climate Design Data Workflow for Boston, MA
Sources and method
Original calculation using latitude 42.3601° N and declinations +23.44°, 0°, and -23.44°. Formula: altitude = 90° - |latitude - declination|. Time zone: America/New_York. Verify occupied-hour positions with the NOAA Solar Calculator; values omit refraction, equation of time, terrain, obstructions, and facade azimuth.
Source links
Frequently asked questions
What is the sun angle in Boston, MA at the summer solstice?
The declination-only solar-noon altitude is approximately 71.1°. This is a transparent geometry check, not a substitute for an hourly solar-position calculation.
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