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The CDC recommends a shot glass of sunscreen to cover your whole body and about half a teaspoon for your face and applying sunscreen at least 20 minutes before exposure to the sun so it can be ...
To make sure you are adequately protecting your skin from damaging rays, dermatologists say this is the exact amount of sunscreen to slather on. Plus, tips on how to reapply.
Reduce time in the sun between 10 a.m. and 4 p.m. If outdoors, seek shade and wear sun-protective clothing, a wide-brimmed hat, and UV-blocking sunglasses. Generously apply broad spectrum SPF 50+ sunscreen every 1.5 hours, even on cloudy days, and after swimming or sweating. Bright surfaces, such as sand, water, and snow, will increase UV exposure.
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The first measure indicates the general sunniness of a location compared with other places, while the latter allows for comparison of sunshine in various seasons in the same location. [1] Another often-used measure is percentage ratio of recorded bright sunshine duration and daylight duration in the observed period.
UPF (ultraviolet protection factor) represents the ratio of sunburn-causing UV without and with the protection of the fabric, similar to SPF (sun protection factor) ratings for sunscreen. While standard summer fabrics have UPF ~6, sun protective clothing typically has UPF ~30, which means that only 1 out of ~30 units of UV will pass through (~3%).
Created Date: 8/30/2012 4:52:52 PM
There are two basic types of sunshine recorders. One type uses the Sun itself as a time-scale for the sunshine readings. The other type uses some form of clock for the time scale. A Jordan sunshine recorder (left). The other instrument is a Marvin sunshine recorder.