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Winter Solstice Sun and Shadow Paths—faster-moving Micro version

This faster-moving video (zoomed-in micro version) illustrates the sun’s path (and the shadows it casts) on the winter solstice—the day with the longest shadows of the year—for a site at 32˚ N latitude. The perspective is from ground level.

See here for the zoomed-out macro version of this video for a perspective from the sky enabling you to see the sun’s changing location in the sky.

This video also illustrates how you can use an awareness of these paths, along with winter-solstice shadow ratios for your latitude (see the chart here) to determine the length and angle of shadows cast by various objects, to maintain winter sun access where needed for passive heating, lighting, and on-site solar-power production.
For example, you can use the shadow ratios for your latitude to figure out the length of shadow cast by a tree (once it reaches its mature size), so the tree can be placed where it will maintain, rather than reduce or eliminate, your ideal winter solar potential.

See the book Rainwater Harvesting for Drylands and Beyond, Volume 1, 3rd Edition by Brad Lancaster available at deep discount direct from the author for more on this and other simple, effective, and dynamic integrated-design tools.

Active SystemsPassive SystemsSun and Shade Harvesting