equinoctial line

equinoctial line ['i:k?n?u'sa???] 音标，中文翻译为“黄道线”，指地球绕太阳公转的轨道在地球上所形成的与地平线平行的圆周，也即太阳在天空中穿越的空间轨迹所形成的圆周。

词源：equinoctial 一词源于拉丁语，意为“昼夜平分的”，line 是线、线条的意思。这个词组在古希腊的天文学家和地理学家中用来描述太阳和月亮的周年视运动路径，也就是太阳和月亮在天空中穿越的空间轨迹所形成的圆周。后来，这个词组被用来描述地球绕太阳公转的轨道在地球上所形成的圆周。

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equinoctial line速记技巧：

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1. 形象记忆法：将equinoctial line的各个点想象成具体的形象，例如春分点（equinox of spring）可以想象成春天的分界线，夏至点（solstice）可以想象成阳光直射最北或最南的点等。

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2. 词组记忆法：将equinoctial line的各个点名称组合成一个词组，例如“昼夜平分的点”（points of equal day and night）或“太阳直射的点”（points where the sun directly illuminates）等，通过词组的含义来记忆。 #

3. 联想记忆法：将equinoctial line的各个点与相关的事物进行联想，例如春分点可以联想到“昼夜平分的风筝”（a kite that is equally divided between day and night），夏至点可以联想到“太阳直射的香蕉”（a banana that is directly illuminated by the sun）。 #

变化形式：

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1. 对比记忆法：将equinoctial line的各个点和其它的天文点进行对比，例如黄赤交角（obliquity of the ecliptic）和赤道（equator）的区别，或者夏至点和极昼极夜最大范围点的关系等。

2. 口诀记忆法：将equinoctial line的各个点的记忆编成口诀，例如“春分夏至九、秋分冬至三”，表示春分、秋分时昼夜平分的天数为9天，夏至、冬至时昼夜平分的天数为3天。 #

3. 图表记忆法：利用图表来记忆equinoctial line的各个点，例如绘制出地球公转轨道上的各点位置，通过观察图表来记忆这些点的位置和意义。

常用短语：

1. equinoctial line of longitude

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2. equinoctial point

3. equinoctial year

4. equinoctial year number #

5. equinoctial year numbering #

6. equinoctial year system #

双语例句：

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1. The equinoctial line is the line along which the sun is directly overhead at the equinoxes.

2. The equinoctial point is the point on the earth's surface directly opposite the vernal equinox. #

3. The equinoctial year is the period of time that corresponds to the time it takes for the earth to rotate on its axis twice and return to its original position. #

4. The equinoctial year number is a system of counting years that begins at the spring equinox and ends at the winter solstice. #

5. The equinoctial year numbering system is a method of counting years that uses the dates of the equinoxes and solstices to determine the year number. #

6. The equinoctial year system is a calendar system that uses the equinoctial year numbering system to determine the dates of important events such as holidays and festivals. #

7. The equinoctial line is a line on the earth's surface that marks the transition between seasons, and it is also a symbolic line for representing the passage of time.