Archives for posts with tag: sun

UV light lowers blood pressure – this explains why blood pressure changes with the season, with highs in winter and lows in summer.

Volunteers using the Planethunters.org website, with astronomers from the US and UK have found a planet with four suns. The planet has been named PH1 and is just under 5000 light-years away from us.

Read the original paper on the Arxiv pre-print server.

Sunshine on your skin triggers your body to make vitamin D, which prevents bone and muscle problems, including rickets, and might even cut your risk of developing multiple sclerosis.

Try to get fifteen minutes in every day when you can, but don’t get burned.

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Some people sneeze when they look at the sun. This may be because the optic nerve (the nerve to the eye) runs close to the trigeminal nerve (a nerve to the face, involved in sneezing) and when one nerve gets stimulated it triggers the other. This is called photic sneezing, and runs in families. About one in four people have photic sneezes.

The act of sneezing is called sternutation. In some people, pulling hair causes sneezing.

It takes the sun 365.242190 days to get round the sun (a solar year or tropical year). Because the calendar year is 365 days, that means we need to add an extra day every four years to keep the calendar year and the solar year in sync. In 1582, the calendar lost ten days – October 4th was followed by October 15th.

Leap years are years that are divisible by four, except… years that are also divisible by 100 are not leap years, unless they are also divisible by 400, when they are leap years. Got that?

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