sidereal year

简明释义

恒星年

英英释义

例句

1.In astrology, the sidereal year 恒星年 is significant for determining the positions of celestial bodies.

在占星术中，sidereal year 恒星年对于确定天体的位置非常重要。

2.The sidereal year 恒星年 is used in calculations for long-term astronomical events.

在长期天文事件的计算中使用sidereal year 恒星年。

3.The difference between a sidereal year 恒星年 and a tropical year is about 20 minutes.

一个sidereal year 恒星年和一个热带年之间的差异大约是20分钟。

4.A sidereal year 恒星年 is approximately 365.256 days long.

一个sidereal year 恒星年大约为365.256天。

5.Astronomers use the sidereal year 恒星年 to measure the time it takes for Earth to orbit the Sun relative to fixed stars.

天文学家使用sidereal year 恒星年来测量地球相对于固定恒星绕太阳公转的时间。

作文

The concept of a sidereal year is fundamental in understanding our planet's position in the cosmos. A sidereal year is defined as the time it takes for the Earth to complete one full orbit around the Sun, relative to the fixed stars. This period is approximately 365.256 days long. It is essential to distinguish between a sidereal year and a solar year, which is about 365.242 days. The difference arises because the Earth is also rotating on its axis as it orbits the Sun, causing the solar year to be slightly shorter than the sidereal year.Understanding the sidereal year helps astronomers and scientists track celestial events and understand the movements of other celestial bodies. For instance, when we observe the night sky, the positions of stars change over time due to the Earth's own motion. The sidereal year provides a framework for measuring these changes accurately. By knowing the length of a sidereal year, astronomers can predict when certain stars will be visible in the night sky, which is crucial for both amateur stargazers and professional astronomers alike.Moreover, the concept of a sidereal year is not only relevant in astronomy but also plays a significant role in various cultural and historical contexts. Ancient civilizations, such as the Babylonians and the Egyptians, were aware of the sidereal year and used it to create calendars that aligned with agricultural cycles. These early calendars were crucial for planting and harvesting crops, demonstrating how the understanding of a sidereal year influenced human civilization.In modern times, the significance of a sidereal year extends beyond agriculture. It is vital for space exploration and satellite technology. For example, satellites in geostationary orbits must account for the sidereal year to maintain their position relative to the Earth’s rotation and orbit. Understanding this concept allows engineers to design and launch satellites that can effectively communicate and gather data without interruptions.Additionally, the sidereal year has implications for navigation and timekeeping. The precise measurement of a sidereal year enables the creation of more accurate astronomical clocks, which are essential for navigation and GPS technology. As we rely more on these systems in our daily lives, the importance of understanding the sidereal year becomes increasingly evident.In conclusion, the sidereal year is a crucial concept that intersects various fields, including astronomy, agriculture, technology, and navigation. Its definition as the time it takes for the Earth to orbit the Sun relative to the stars provides insight into the workings of our universe. By grasping the significance of a sidereal year, we can appreciate the intricate relationships between celestial movements and their impact on our lives. Whether we are gazing at the stars, planning agricultural activities, or relying on GPS systems, the sidereal year remains an essential element of our understanding of time and space.

“恒星年”的概念在理解我们星球在宇宙中的位置方面是基础性的。恒星年被定义为地球围绕太阳绕行一周所需的时间，相对于固定的星星。这个周期大约为365.256天。需要区分的是，恒星年与太阳年之间的区别，太阳年大约为365.242天。这种差异产生的原因是地球在围绕太阳转动的同时，也在自转，导致太阳年比恒星年略短。理解恒星年有助于天文学家和科学家追踪天体事件，并理解其他天体的运动。例如，当我们观察夜空时，由于地球自身的运动，星星的位置会随时间变化。恒星年提供了一个准确测量这些变化的框架。通过知道恒星年的长度，天文学家可以预测某些星星何时会在夜空中可见，这对业余观星者和专业天文学家都至关重要。此外，恒星年的概念不仅在天文学中相关，还在各种文化和历史背景中发挥着重要作用。古代文明，如巴比伦人和埃及人，意识到恒星年并利用它创建与农业周期相一致的日历。这些早期的日历对于播种和收获作物至关重要，展示了对恒星年的理解如何影响人类文明。在现代，恒星年的意义超越了农业。它对太空探索和卫星技术至关重要。例如，处于静止轨道的卫星必须考虑恒星年，以保持其相对于地球自转和轨道的位置。理解这一概念使工程师能够设计和发射能够有效通信和收集数据而不受干扰的卫星。此外，恒星年对导航和计时也有影响。对恒星年的精确测量使得更准确的天文钟的创建成为可能，而这些钟对于导航和GPS技术至关重要。随着我们在日常生活中越来越依赖这些系统，理解恒星年的重要性变得愈加明显。总之，恒星年是一个关键概念，涉及多个领域，包括天文学、农业、技术和导航。它作为地球相对于星星绕太阳公转所需的时间的定义，为我们提供了对宇宙运作的洞察。通过掌握恒星年的重要性，我们可以欣赏天体运动与我们生活之间复杂的关系。无论我们是在仰望星空、规划农业活动，还是依赖GPS系统，恒星年始终是我们理解时间和空间的重要元素。