3.11月相
章节大纲
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Can the Moon cast shadows?
::月亮能投下阴影吗?Of course! A full moon is very bright. It is bright enough to cast shadows. If you are out away from city lights and the Moon is full you might cast your own Moon shadow .
::当然,满月是明亮的,足以投下阴影。如果你们远离城市的光芒,而月亮满了,你们就抛下自己的月光阴影。The Phases of the Moon
::月球的阶段The Moon does not produce any light of its own. It only reflects light from the . The Moon has phases because it orbits around Earth. One orbit takes about 28 days. As the moon moves around Earth, different parts of it appear to be lit up by the Sun. The Moon sometimes appears fully lit and sometimes completely dark. Sometimes it is partially lit. The different appearances of the Moon are referred to as phases of the Moon ( Figure ).
::月球本身不产生任何光,它只反映来自月球的光。月球有各个阶段,因为它环绕地球。一个轨道需要大约28天。随着月球环绕地球,它的不同地区似乎被太阳照亮。月球有时会全亮,有时甚至完全黑暗。月球有时部分亮光。月球的不同外观被称为月球的阶段(图 )。The moon's phases are a result of the moon's orbit around Earth. A new moon occurs when the lit side is facing away from Earth. This happens when the Moon is between the Earth and the Sun. Sometimes you can just barely make out the outline of the new moon in the sky. This is because some sunlight reflects off the Earth and hits the Moon.
::当亮光的一面正向着地球而去时,就会出现新的月亮。当月亮在地球和太阳之间时,就会发生这种情况。有时,你几乎无法描述天空中新月的轮廓。这是因为有些阳光反射地球,撞击月球。The moon grows as a waxing crescent . During the crescent moon phase, the Moon is less than half-lit. About one week later, the Moon enters the first quarter-moon phase. Only half of the Moon’s lit surface is visible from Earth, so it appears as a half circle.
::月亮像新月一样成长。 在月亮新月阶段,月亮不到半亮。 大约一周后,月亮进入了第一个季度的月亮阶段。 月亮表面的亮度只有一半从地球可见,因此,月亮的亮度是半圆的。The moon grows through the waxing gibbous phase. During the gibbous moon phase, the Moon is more than half-lit. After another week, the Moon reaches the far side of the Earth from the Sun. The side of the Moon facing Earth is completely lit. This is called a full moon.
::月亮在滚动的月球中成长。 在滚动的月球阶段,月亮的半光度超过半光。 一周后,月球从太阳到达地球的远方。 月球向地球的面面完全亮着。 这被称为满月 。The moon then passes through the waning gibbous phase for another week until the Moon is in the third quarter-moon phase. Finally, after a week as a waning crescent, the Moon is back to new.
::然后,月球又经过了半衰期,又过了一周,直到月球进入了第三个季度的月球阶段。 最后,在过了一周的日落后,月球又回到了新的阶段。The Moon undergoes a complete cycle of phases about every 29.5 days. This is slightly longer than the amount of time it takes the Moon to orbit the Earth because the Earth and Moon are also moving in their orbit around the Sun.
::月球每29.5天经历一个完整的阶段周期,大约每29.5天一次,这比月球绕地球运行所需的时间略长,因为地球和月球也在太阳周围的轨道上移动。Summary
::摘要- The appearance of the Moon from Earth has distinct phases.
::月球从地球的外观有不同的阶段。
- A full moon is completely lit; a new moon is completely dark.
::满月完全亮亮;新月完全黑暗。
- A gibbous moon is more than half lit; a crescent moon is less than half lit.
::闪烁的月亮超过半光;新月亮不到半光。
Review
::回顾- Describe how the Sun, Moon, and Earth are aligned during a full moon.
::描述太阳、月亮和地球在满月时是如何对齐的。
- Describe how the Sun, Moon, and Earth are aligned during a new moon.
::描述太阳、月亮和地球在新月中是如何对齐的。
- Draw and label pictures of the Moon in its phases.
::绘制和标注月球各阶段的图片。
Explore More
::探索更多Use the resource below to answer the questions that follow.
::利用以下资源回答以下问题。- Why does the moon have phases?
::为什么月亮有阶段?
- What are the four main phases of the moon? How long does it take to change from one to another?
::月球的四个主要阶段是什么?
- What is the name for a moon that is less than half full? More than half full?
::半满的月亮叫什么名字 半满的月亮
- What is the name for a moon that is getting larger? Getting smaller?
::月亮越变越大叫什么名字 越变越小
- What causes a lunar eclipse? Why doesn't a lunar eclipse occur during each full moon?
::月蚀是什么原因?为什么月蚀不会在每个满月时发生?
- The appearance of the Moon from Earth has distinct phases.
