• Outdoor San Diego alerts

Tree Heights can be easily measured this week if the sun shines at midday. On or near Friday, February 18, at or very near 12 noon, the sun as seen from San Diego County stands at an altitude of 45 degrees above the horizon. Under those conditions, the length of a shadow cast by a vertical tree trunk on a horizontal surface equals the height of the tree trunk. Even if you lack a measuring tape, you can still use your own feet to pace the distance heel-to-toe: the length of an average adult male’s shoe sole, for example, is very close to one foot.

  • Outdoor San Diego alerts

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