Garden Sun Almanac

How many hours of direct sun each patch of a yard gets, month by month. Click a tree or structure to change it — your edits save automatically in this browser.

Click the ground to check a spot · click a tree or structure to see its name and edit it · drag to move · drag the corner dot to resize

Month (21st)

Legend

0 h36912+ h

Selected spot

Click anywhere on the ground to see its sun hours for every month.

This month in the yard

Sun on the 21st

Selected object

Select a structure or tree to edit its size and height. Use “+ Structure” (drag a box) or “+ Tree” (click) to add more.

Yard & location

Yard width (ft) Yard depth (ft) North direction — degrees clockwise from top of plan: Latitude Longitude Time zone

Location is set to the Kingwood area of Houston. Roof and tree heights are estimates, so adjust them as you measure. Edits save automatically in this browser; use Export for a backup file or to move the layout to another device.

How it’s calculated

Sun position uses standard astronomical formulas, sampled every 10 minutes on the 21st of each month. A spot counts as sunlit when a straight line to the sun clears every object; roofs and canopies are modeled as boxes and ellipsoids. Deciduous trees let more light through Dec–Feb, partly in Mar and Nov. Sun lower than 3° is ignored (haze and neighbors). Clouds are not included — this is clear-sky direct sun, the measure plant tags use.