why does the sun rise and set at different times

What time did the rise this morning? What time will it
this evening? The answers to those questions depend upon where you live and what time of year it is. Have you ever given much thought to sunrises and sunsets? Wouldn't it be great if the rose every morning at the same time? Wouldn't you the of knowing when the Sun would set at the same time each night? Unfortunately, the world doesn't work that way. If you live in North America, you probably look forward to those long days when you can play outside for hours on end because the Sun doesn't set until late in the evening. Likewise, you might short winter days. You get up for school before the Sun rises and then you have any time to play after school and do homework before it gets dark.


Things would be different if: (1) orbited the Sun in a circle; and (2) Earth's was to the of its (straight up and down). If that were the case, the Sun would rise and set at the same times every day. It would also take the same across the sky every day of the year. However, neither of those is true for Earth. Instead of a perfectly-, Earth's around the Sun is. This means that the Sun travels across the sky at different speeds from day to day depending upon where Earth is in its. Earth's is also not to the of its. Instead, Earth is tilted on its 23. 4б. This is what gives us our seasons here on Earth. When the North Pole is tilted toward the Sun, the Northern experiences summer, and the Sun is high in the sky at noon.


During the winter, the North Pole is tilted away from the Sun, and at noon the Sun doesn't get nearly as high in the sky. Earth's tilt also explains why the longest day of the year occurs on the summer solstice (usually around June 21). Likewise, the shortest day of the year occurs on the winter solstice (usually around December 21). The of Earth's and the tilt of its results in the Sun taking different paths across the sky at different speeds each day. This gives us different sunrise and sunset times each day. Once the summer solstice passes, you'll notice the days begin to get shorter each day. This trend continues until the winter solstice, the shortest day of the year. After the winter solstice, days get longer each day up until the summer solstice, and the process repeats year after year.


Plotted here are the variations in the times of sunrise and sunset at six different locations. Can you figure out which is which? Kiruna, Sweden: latitude 67 North Mt. Palomar, California: latitude 33 North Mauna Kea, Hawaii: latitude 19 North Bosccha, Indonesia: latitude -6 South Cerro Tololo, Chile: latitude -31 South What do you notice about the sunrise and sunset times on the first day of spring and the first day of fall? This will take you to the Astronomical Almanac time keeping site of the US Naval Obseravatory where you can find the sunrise and sunset time for any place by date and longitude and latitude.

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