why does the length of daylight change during the year? and what is a jet lag?

Answer 1

The length of daylight changes as the earth's axis tilts from Summer to Winter and back to summer again. As the northern hemisphere is at it's maximum tilt, it is the 1st day of summer (the longest day of the northern hemisphere). As it shifts the other direction, it is the shortest day in the northern hemisphere.

Jet lag is the physical reaction of your internal body clock to traveling around the world. If you lived on the west coast of the USA and then travelled to say: Iraq, your body clock would be off almost 10 hours. What would happen is that you would be wanting to stay up all night and sleep during the day as your body is "used" to its sleep patterns.

Answer 2

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