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Navigating and enjoying the thrill of horror and scare experiences
Historical knowledge of Halloween and its origins
Understanding and appreciating Halloween traditions worldwide
The two spring dates
For people living in the northern hemisphere, spring has two official start dates.
Meteorologists consider 1 March a spring day, according to the seasons formalised in the 1900s. However, the astronomical seasons show spring starting at the vernal equinox, which falls on 20 March.
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Effects of bright light
The good light at the onset of spring is brighter and makes spring feel so central. Daylight is noticeably increasing in length, and the sky is bluer.
Bright light can make us happier. It can be as effective in treating depression as Prozac. Some data reveals that ...
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Spring and Vitamin D
Research associates a deficiency in vitamin D with depression. Spring is when we can expect to start making vitamin D from sun exposure.
However, if the UV index is less than two, then you will not make enough vitamin D in a reasonable time. To get the full benefit, you h...
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Equinoxes and the circadian rhythm
The spring and autumn equinoxes lie halfway between the shortest and longest days of the year. At these points, day and night are mostly even lengths all over the world.
These conditions may suit the human circadian rhythm - the daily cycle that affects the body's sleep, w...
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The Vernal Equinox
Before the invention of calendars and other modern methods of tracking years and seasons, people relied on the position of the sun in the sky and obvious signs in nature to indicate the passing of time.
When the equator and the hemispheres of the Earth became common kn...
Orbit an rotation
As mars orbits the Sun, it completes one rotation every 24,6 hours, which is very similar to one day on Earth (23.9 hours). Martian days are called sols—short for "solar day." A year on Mars lasts 669.6 sols, which is the same as 687 Earth days.
Mars' axis of rotation is tilted 25 degrees w...
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