sidereal hour angle of the mean sun

简明释义

平太阳的恒星时角

英英释义

例句

1.The formula for the sidereal hour angle of the mean sun is essential for astronomers to predict solar events.

计算平均太阳的恒星时角的公式对于天文学家预测太阳事件是必不可少的。

2.The sidereal hour angle of the mean sun helps navigators find their longitude at sea.

平均太阳的恒星时角帮助导航员在海上找到他们的经度。

3.The astronomer calculated the sidereal hour angle of the mean sun to determine the position of celestial objects.

天文学家计算了平均太阳的恒星时角以确定天体的位置。

4.Understanding the sidereal hour angle of the mean sun is crucial for accurate timekeeping in astronomy.

理解平均太阳的恒星时角对于天文学中的准确计时至关重要。

5.During the lecture, we learned how to calculate the sidereal hour angle of the mean sun using a celestial sphere model.

在讲座中，我们学习了如何使用天球模型计算平均太阳的恒星时角。

作文

The concept of the sidereal hour angle of the mean sun is fundamental in the fields of astronomy and navigation. To understand this term, we must first break it down into its components. The term 'sidereal' refers to the stars, specifically the time it takes for the Earth to rotate once on its axis relative to the distant stars, which is about 23 hours, 56 minutes, and 4 seconds. This rotation period is slightly shorter than the solar day, which is based on the position of the Sun in the sky. The difference arises because as the Earth rotates, it also orbits around the Sun, causing the apparent position of the Sun to shift slightly each day.Next, we have the 'hour angle,' which is a measure of time expressed in angular measurement. It represents the angle that the Earth has rotated around its axis from a reference point, typically the vernal equinox, to a specific celestial object, such as the mean sun. The hour angle increases by 15 degrees per hour since there are 360 degrees in a full rotation of the Earth over 24 hours.Finally, the 'mean sun' is an imaginary concept used in timekeeping. It represents an average position of the Sun throughout the year, smoothing out the variations caused by the Earth's elliptical orbit and axial tilt. The mean sun moves at a constant rate along the celestial equator, unlike the actual Sun, which appears to move unevenly due to these factors.When we combine these concepts, the sidereal hour angle of the mean sun becomes a critical tool for astronomers and navigators. It allows them to determine the position of the mean sun in the sky at any given moment, which is essential for accurate timekeeping and navigation. For example, if one knows the sidereal hour angle of the mean sun, they can calculate the local solar time, which is crucial for various applications ranging from agriculture to aviation.In practical terms, understanding the sidereal hour angle of the mean sun helps in synchronizing clocks and ensuring that time is measured accurately across different regions. This is particularly important in our modern world where precise timing is essential for communication, transportation, and many other aspects of daily life. Without this understanding, we would struggle to coordinate activities across time zones and maintain a consistent schedule.Moreover, the sidereal hour angle of the mean sun plays a pivotal role in astronomical observations. For instance, astronomers use it to track the movement of celestial bodies and predict events such as eclipses or transits. By knowing the hour angle, they can align their telescopes accurately and gather data that contributes to our understanding of the universe.In conclusion, the sidereal hour angle of the mean sun is not just a theoretical concept; it is a practical tool that bridges the gap between astronomy and everyday life. Its implications reach far beyond the realm of science, affecting how we perceive and measure time. As we continue to explore the cosmos, the importance of such concepts will only grow, reminding us of the intricate relationship between our planet and the stars above us.

“平均太阳的恒星时角”这个概念在天文学和导航领域中是基础性的。要理解这个术语，我们首先需要将它分解成几个组成部分。“恒星”一词指的是星星，特别是地球相对于遥远的星星自转一圈所需的时间，大约为23小时56分钟4秒。这个自转周期比基于太阳在天空中的位置的太阳日稍短。这种差异的产生是因为当地球自转时，它也围绕着太阳公转，导致太阳的表观位置每天稍微移动。接下来是“时角”，它是以角度测量表示的时间度量。它代表了地球围绕其轴从参考点（通常是春分点）旋转到特定天体（如平均太阳）的角度。时角每小时增加15度，因为地球在24小时内完成360度的完整旋转。最后，“平均太阳”是一个用于计时的虚构概念。它代表了一年中太阳的平均位置，平滑了由于地球椭圆形轨道和轴倾斜造成的变化。平均太阳沿着天球赤道以恒定速率移动，不同于实际太阳，由于这些因素，它的运动显得不均匀。当我们将这些概念结合起来时，“平均太阳的恒星时角”成为天文学家和导航员的重要工具。它使他们能够确定任何给定时刻平均太阳在天空中的位置，这对准确的计时和导航至关重要。例如，如果知道“平均太阳的恒星时角”，就可以计算当地的太阳时间，这对农业、航空等各种应用都至关重要。在实际操作中，理解“平均太阳的恒星时角”有助于同步时钟，确保时间在不同地区的准确测量。这在我们现代社会中尤为重要，因为精确的计时对通信、交通和日常生活的许多其他方面都是必不可少的。如果没有这种理解，我们将难以协调跨时区的活动并保持一致的时间表。此外，“平均太阳的恒星时角”在天文观测中也发挥着关键作用。例如，天文学家使用它来追踪天体的运动并预测日食或过境等事件。通过了解时角，他们可以精确对齐望远镜，收集数据，从而促进我们对宇宙的理解。总之，“平均太阳的恒星时角”不仅是一个理论概念；它是一个实用工具，架起了天文学与日常生活之间的桥梁。它的影响远远超出了科学领域，影响着我们如何感知和测量时间。随着我们继续探索宇宙，这些概念的重要性只会增加，提醒我们地球与星空之间复杂的关系。