Sun Path / Sun Angle Viewer

Visualize solar altitude and azimuth across a day for your site. Useful for greenhouse orientation, glazing, and seasonal shading.

Location & Date

Type an address, ZIP, or city — or paste "lat, lon". Use "My location" for browser-detected coords.

Site location

Denver, Colorado, United States

39.7392°, -104.9903° · UTC-7

Date

Altitude vs Time

Solar elevation angle through the day

Azimuth Polar Plot

Compass plot colored by altitude

Natural DLI at this site

Engineering estimate (clear-sky model). Apply cover + crop target to see when supplemental light is needed.

Glazing / cover

Custom transmittance %

Crop target DLI

Custom target (mol/m²/day)

Clear-sky fraction

75% clear-sky (typical mid-latitude annual ≈ 75%)

Lower this for cloudier climates (Pacific Northwest ≈ 55%, Arizona ≈ 85%).

Jan

10.6

Feb

15.7

Mar

22.2

Apr

29.3

May

34.4

Jun

36.6

Jul

35.7

Aug

31.6

Sep

25.1

Oct

18.0

Nov

12.0

Dec

9.3

Meets target Below targetTarget (22 mol/m²/day)

Peak month

Jun — 36.6

mol/m²/day

Worst month

Dec — 9.3

mol/m²/day

Supplemental needed

5 of 12 months

Below 22 mol/m²/day

Supplemental DLI & fixture sizing

Gap between target and natural DLI, plus the PPFD you need from fixtures to fill it.

Supplemental photoperiod (hours/day)

14 h/day of supplemental lighting

Target DLI

22.0 mol/m²/day

Cover 70% PAR · 75% clear sky

Jan

+11.4

226 µmol

Feb

+6.3

125 µmol

Mar

—

Apr

—

May

—

Jun

—

Jul

—

Aug

—

Sep

—

Oct

+4.0

79 µmol

Nov

+10.0

198 µmol

Dec

+12.7

251 µmol

Natural DLI (capped at target) Supplemental needed

Worst-month deficit

Dec — 12.7

mol/m²/day shortfall

Required PPFD (worst month)

251 µmol/m²/s

over 14 h/day

Annual supplemental

1331 mol/m²/yr

Rough estimate (30 d/month)

Ready to size fixtures?

Design a fixture layout that delivers 252 µmol/m²/s for worst month (Dec).

Required PPFD assumes uniform delivery across the photoperiod; actual fixture count depends on mounting height, beam angle, and canopy target area. The designer will honor the target PPFD and auto-size a fixture grid.

Loading VibeLux...