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Those opting for spray sunscreen should also rub the formula into the skin after spraying, especially if you are already outdoors, as the method can result in uneven coverage and unprotected skin ...
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.
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.
is an approximation of mean solar time at integer expressed as a Julian day with the day fraction. l ω {\displaystyle l_{\omega }} is the longitude (west is negative, east is positive) of the observer on the Earth;
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 ...
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Comparisons with automatic instruments at German stations revealed that during summer the differences of the two measurement systems can reach up to 4 h per day. The mean difference was −0.23 h, i.e. the measurements of the Campbell–Stokes recorder are larger than the automatic.
Intensity of thermal radiation from the sun depends on view factor. In radiative heat transfer, a view factor, , is the proportion of the radiation which leaves surface that strikes surface .