Week 6 Shirley's Blog
Intro some new rules of the course.
Here are my answers:
1. It because the different positions between moon, sun and the earth
2. Because the sun move around the earth, make the different temperature at the different side of the earth.
3. The moon just in the middle of the moon and earth.
We have the snowball represent the moon and a light bulb represent sun, then I know about If the moon is exactly halfway between the earth and the sun, which they are all on the straight line in that situation, it will cause a solar eclipse, and if the moon is exactly blocked by the sun, and on the straight line as well in this situation, it will cause a lunar eclipse. with Lauren's help.
Earth---------Moon----------Sun Solar eclipse
Moon--------Earth-----------Sun lunar eclipse
What is a Solar System
-Solar system is Sun system. Sun is the center of the Solar system.
-The earth is in the middle and the sun goes around us.
New moon ---Quarter moon
Blue Moon
Lecture：
What did I learned:
1. Heliocentrism vs Geocentrism:
Copernicus popularized the concept of heliocentrism–the theory that the Sun is at the center of the universe and Earth orbits the Sun. 哥白尼提出了日心说，太阳为中心，地球围着太阳转
To remember the theories of heliocentrism and geocentrism, break down the names and look at the etymology.
- The root geo– means “earth”, and centr– means “center”. So, geocentrism is the theory in which Earth is at the center of the solar system.
- The root helio– means “sun”, and centr– means “center”. So, heliocentrism is the theory in which the Sun is at the center of the solar system.
2. Phases of the Moon
The Moon orbits around Earth once every 28 days, or about once a month. 月球绕地球公转一个月一次
The phases of the moon are:
- New: The Moon’s face is not visible from Earth 从地球上看不到月球表面
- Crescent: Between a new moon and a quarter moon 新月与弦月之间
- Quarter: From Earth, we can see half of the moon’s face which is a quarter of the entire moon 从地球上看，我们可以看到月球表面的一半，即整个月球的四分之一
- Gibbous: Between a quarter moon and a full moon 介于上弦月和满月之间
- Full: All of the Moon’s face is visible from Earth 从地球上可以看到月球的整个表面
For the first half of this cycle, the visible part of the Moon waxes or grows larger. After reaching a full moon, the Moon wanes or grows smaller for the second of the cycle. 周期前半部分，月亮的可见部分会逐渐增大，后半部分则逐渐减小
There are 2 equinoxes and 2 solstices per year – Spring Equinox, Autumn Equinox, Winter Solstice, and Summer Solstice.
Equinoxes 昼夜平分点 (which sounds like the word equal) mark the day in which all of Earth receives an equal amount of sunlight–12 hours.
4. Eclipses
Solar Eclipse
- In a solar eclipse the Sun is being blocked–this happens when the Moon perfectly crosses between Earth and the Sun. A solar eclipse always occurs during a new moon.
Lunar Eclipse
- In a lunar eclipse, the Moon is blocked when it passes through Earth’s shadow. When the Moon is in this position, the Sun’s light cannot reach it. A lunar eclipse always occurs during a full moon.
Seasons: Earth orbits in the same plane as the other planets in our solar system: the Plane of the Ecliptic.黄道面.
- If a hemisphere is tilted towards the Sun it gets more sunlight and it warms up–aka summer.
- If a hemisphere is tilted away from the Sun it gets less sunlight and it cools down–aka winter.
- As Earth orbits around the Sun, different areas receive direct or indirect sunlight due to the tilt of Earth on its axis. This is what causes seasons. 地球绕太阳公转时，由于地球轴线倾斜，不同地区会受到直射或间接阳光照射。这就是季节形成的缘由。
- Earth’s distance away from the Sun does not cause the seasons. 地球与太阳的距离不会影响季节。
- The tropic lines, equator, arctic circle all mark areas of specific direct sunlight. 回归线、赤道、北极圈都标志着特定的阳光直射区域
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