Health
Do you need more vitamin D in the winter?
Vitamin D is a nutrient your body needs to keep your bones healthy and strong. It also has properties that support your immune system and neuromuscular health.
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News tagged with sunlight
Oncology & Cancer
Q&A: Tips for cancer patients to stay safe in the summer
I have diabetes and high blood pressure. I take medication but have committed to a healthier lifestyle, including daily walks outside, swimming and other outdoor activities with my family. Recently, I was diagnosed with breast ...
Aug 9, 2023
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Health
Summer heat is especially dangerous for babies and toddlers. Here's how to protect them
As extreme summer heat continues to grip the region, young children are at a greater risk for heat exhaustion and heat stroke.
Jul 31, 2023
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Diseases, Conditions, Syndromes
Tick season is starting sooner, and they are showing up in new places
As tick season gets into full swing, we spoke with two experts who study them to learn about the latest in tick research and how to stay protected. Emily Struckhoff is a vector-borne disease program specialist with Penn State ...
Jul 6, 2023
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Health
Q&A: Cardiologist answers questions about health and heat
The summer heat is here and with it questions about how we should handle high temperatures and what we should do to feel well in the heat.
Jun 30, 2023
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Oncology & Cancer
Outdoor activities and skin cancer: What you need to know
Exercise has been associated with a lower risk for certain types of cancer, such as breast, colon, and prostate. But skin cancer is a lingering concern for those spending time outside.
Jun 8, 2023
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Oncology & Cancer
Skin cancer survivors: How to stay safe in the sunshine
For many people, playing and relaxing in the sun is fun. But for skin cancer survivors, the sun can be a source of fear and anxiety. That's because sun exposure is one of the most significant risk factors for developing skin ...
May 11, 2023
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Health
Women working rotating shifts especially likely to be frail, study finds
A new study led by researchers at York University has found a link between shift work and frailty among middle-aged and older workers in Canada, especially for women on rotating shifts.
Mar 17, 2023
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Psychology & Psychiatry
Who is at risk for seasonal affective disorder?
Seasonal affective disorder is a type of depression related to changes in seasons. Millions of adults in the U.S. may suffer from seasonal affective disorder, although many may not know they have the condition, according ...
Nov 2, 2022
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Psychology & Psychiatry
More than winter blues: Seasonal depression tips, insight from health experts
As the fall season comes and gloomy weather rolls in, so do the feelings of sadness and fatigue for many. One Sacramento area clinical psychologist said she gets more calls—and an increase in reported depression symptoms—this ...
Nov 12, 2021
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Sunlight
Sunlight, in the broad sense, is the total spectrum of the electromagnetic radiation given off by the Sun. On Earth, sunlight is filtered through the atmosphere, and the solar radiation is obvious as daylight when the Sun is above the horizon. Near the poles in summer, the days are longer and the nights are shorter or non-existent. In the winter at the poles the nights are longer and for some periods of time, sunlight may not occur at all. When the direct radiation is not blocked by clouds, it is experienced as sunshine, a combination of bright light and heat. Radiant heat directly produced by the radiation of the sun is different from the increase in atmospheric temperature due to the radiative heating of the atmosphere by the sun's radiation. Sunlight may be recorded using a sunshine recorder, pyranometer or pyrheliometer. Sunlight takes about 8.3 minutes to reach the Earth. The World Meteorological Organization defines sunshine as direct irradiance from the Sun measured on the ground of at least 120 watts per square metre.
Direct sunlight has a luminous efficacy of about 93 lumens per watt of radiant flux, which includes infrared, visible, and ultra-violet light. Bright sunlight provides luminance of approximately 100,000 candela per square meter at the Earth's surface.
Sunlight is a key factor in photosynthesis, a process crucially important for life on Earth.
This text uses material from Wikipedia, licensed under CC BY-SA
