Shadow length of a beach umbrella at solar noon

Method

Sample of 96 umbrellas set upright, surveyed at solar noon over four weeks. Umbrellas tilted beyond ten degrees are excluded. The measure runs from the pole to the tip of the shadow.

Source

No public source. Internal index.

Nature

Experimental index

Internal index. It relies on no public source and describes no identifiable institution or person.

Confidence

Low