sidereal hour angle

简明释义

共轭赤经

英英释义

例句

1.Using the sidereal hour angle 恒星时角, navigators can accurately plot their course based on the stars.

利用sidereal hour angle 恒星时角，导航员可以根据星星准确绘制航线。

2.Astronomical software often includes calculations for the sidereal hour angle 恒星时角 to aid amateur astronomers.

天文软件通常包括对sidereal hour angle 恒星时角的计算，以帮助业余天文学家。

3.The sidereal hour angle 恒星时角 is measured in degrees and indicates how far a celestial object has moved from the observer's meridian.

sidereal hour angle 恒星时角 以度为单位测量，表示天体从观察者的子午线移动了多远。

4.To calculate the position of a star at any given time, astronomers often refer to the sidereal hour angle 恒星时角.

为了计算某一时刻星星的位置，天文学家通常会参考sidereal hour angle 恒星时角。

5.The sidereal hour angle 恒星时角 helps in determining when a celestial object will be visible in the night sky.

sidereal hour angle 恒星时角 有助于确定天体何时会在夜空中可见。

作文

The concept of sidereal hour angle is fundamental in the field of astronomy and celestial navigation. It refers to the angle that describes the position of a celestial object in relation to the observer's local meridian, measured in time. Specifically, the sidereal hour angle is defined as the angle between the observer's meridian and the hour circle of the celestial object, expressed in hours. This measurement is crucial for astronomers as it allows them to determine when a particular star or planet will be visible in the night sky.To understand the sidereal hour angle, one must first grasp the concept of the celestial sphere, an imaginary sphere surrounding the Earth onto which all celestial objects can be projected. The celestial equator is the projection of the Earth's equator onto this sphere, and the local meridian is the great circle that passes through the zenith (the point directly overhead) and connects the north and south points on the horizon. When we observe the sky, stars and planets appear to move along paths called hour circles, which are perpendicular to the celestial equator.The sidereal hour angle is measured from the local meridian, where it is zero at the moment when a celestial object crosses the meridian. As time progresses, the sidereal hour angle increases, indicating that the object is moving westward across the sky due to the rotation of the Earth. One complete rotation of the Earth corresponds to 24 hours, so each hour represents an angle of 15 degrees in terms of the sidereal hour angle. This means that after one hour, the sidereal hour angle would be 15 degrees, after two hours it would be 30 degrees, and so on.Understanding the sidereal hour angle is particularly important for navigators and astronomers who need to track celestial objects accurately. For example, when planning observations or navigating by the stars, knowing the sidereal hour angle helps in predicting when a star will rise or set. This information is vital for both amateur stargazers and professional astronomers alike.Additionally, the sidereal hour angle is closely related to the concept of right ascension, which is another coordinate used to describe the position of celestial objects. Right ascension is akin to longitude on Earth but is measured in hours, minutes, and seconds. The sidereal hour angle can be thought of as the difference between the local sidereal time and the right ascension of the object. This relationship further emphasizes the importance of the sidereal hour angle in celestial mechanics and navigation.In conclusion, the sidereal hour angle is a crucial concept in astronomy that allows observers to pinpoint the location of celestial bodies in the night sky. By measuring the angle in relation to the local meridian, astronomers can predict visibility and track the movement of stars and planets. The practical applications of understanding the sidereal hour angle extend beyond mere observation; they are essential for navigation and enhancing our comprehension of the universe. As technology advances and our exploration of space continues, the significance of the sidereal hour angle will undoubtedly remain a cornerstone of astronomical study and practice.

“星际时角”这个概念在天文学和天体导航领域中至关重要。它指的是描述天体相对于观察者本地子午线位置的角度，以时间为单位进行测量。具体来说，星际时角被定义为观察者的子午线与天体的时圈之间的角度，以小时为单位。这一测量对天文学家至关重要，因为它使他们能够确定特定的星星或行星何时会在夜空中可见。要理解星际时角，首先必须掌握天球的概念，即一个想象中的球体，围绕地球，所有天体都可以投影到这个球体上。天球赤道是地球赤道在此球体上的投影，而本地子午线是通过天顶（正上方的点）并连接地平线上南北两点的大圆。当我们观察天空时，星星和行星似乎沿着称为时圈的路径移动，这些路径与天球赤道垂直。星际时角是从本地子午线测量的，当天体穿过子午线的那一刻，它的值为零。随着时间的推移，星际时角增加，表明该天体因地球自转而向西移动。地球的一次完整自转对应于24小时，因此每小时代表星际时角的15度。这意味着经过一个小时后，星际时角将为15度，经过两个小时后将为30度，依此类推。理解星际时角对于需要准确追踪天体的导航员和天文学家尤其重要。例如，在计划观测或通过星星导航时，了解星际时角有助于预测一颗星星何时会升起或落下。这些信息对于业余观星者和专业天文学家来说都是至关重要的。此外，星际时角与另一种用于描述天体位置的坐标——赤经密切相关。赤经类似于地球上的经度，但以小时、分钟和秒来测量。星际时角可以被视为地方恒星时间与天体赤经之间的差异。这种关系进一步强调了星际时角在天体力学和导航中的重要性。总之，星际时角是天文学中的一个关键概念，使观察者能够准确定位夜空中的天体。通过相对于本地子午线测量角度，天文学家可以预测天体的可见性并跟踪星星和行星的运动。理解星际时角的实际应用不仅限于观察，它们对导航和增强我们对宇宙的理解至关重要。随着科技的进步和我们对太空探索的持续，星际时角的重要性无疑将继续成为天文学研究和实践的基石。