local sidereal time

简明释义

地方恒星时

英英释义

例句

1.Astronomers often use local sidereal time to determine the best moment to observe celestial objects.

天文学家常常使用地方恒星时间来确定观察天体的最佳时刻。

2.The local sidereal time can be calculated using the position of the stars in the night sky.

可以通过夜空中星星的位置计算出地方恒星时间。

3.When planning an observation session, it's crucial to check the local sidereal time to optimize viewing conditions.

在计划观测会话时，检查地方恒星时间以优化观测条件是至关重要的。

4.To accurately align the telescope, you need to know the local sidereal time for your location.

为了准确对准望远镜，您需要知道您所在位置的地方恒星时间。

5.The local sidereal time changes by about four minutes each day due to the Earth's rotation.

由于地球的自转，地方恒星时间每天大约变化四分钟。

作文

Understanding time is crucial for various scientific and practical applications, especially in astronomy. One important concept in this field is local sidereal time, which refers to the time based on the position of stars rather than the sun. This measurement is essential for astronomers who need to track celestial objects accurately. Unlike solar time, which is determined by the Earth's rotation relative to the sun, local sidereal time is based on the Earth's rotation relative to distant stars. As a result, one sidereal day is about 23 hours, 56 minutes, and 4 seconds long, making it slightly shorter than the solar day we commonly use.To grasp the significance of local sidereal time, consider how astronomers utilize it to locate stars and other celestial bodies. When an astronomer wants to observe a particular star, they must know when that star will be at its highest point in the sky, known as culmination. This moment can be predicted accurately using local sidereal time, allowing for precise planning of observations. For instance, if a star culminates at 10 PM local sidereal time, the observer knows to be ready at that time to see the star at its best.Moreover, local sidereal time varies depending on the observer's longitude. Each observer on Earth has a different local sidereal time because the Earth rotates about its axis, causing different stars to appear in the night sky at different times. This variation is why astronomers often convert local sidereal time to universal time when coordinating observations across different locations.Additionally, the application of local sidereal time extends beyond just astronomy. It plays a vital role in navigation, particularly in celestial navigation. Sailors and aviators use local sidereal time to determine their position on Earth by observing the stars. By knowing the local sidereal time, they can calculate their longitude and ensure they are on the right course. This method of navigation has been used for centuries and remains relevant today, showcasing the enduring importance of understanding local sidereal time.In conclusion, local sidereal time is a fundamental concept in astronomy and navigation that allows for accurate tracking of celestial objects and positions on Earth. Its reliance on the stars rather than the sun provides a unique perspective on timekeeping that is essential for professionals in these fields. Whether for planning astronomical observations or navigating the seas, the understanding of local sidereal time continues to be a critical component of our interaction with the universe. As we advance in technology and deepen our exploration of space, mastering concepts like local sidereal time will remain vital for future discoveries and innovations.

理解时间对于各种科学和实际应用至关重要，特别是在天文学领域。一个重要的概念是地方恒星时，它指的是基于星星位置而非太阳的位置来计算的时间。这一测量对于需要准确追踪天体的天文学家来说至关重要。与太阳时间不同，太阳时间是根据地球相对于太阳的自转来确定的，而地方恒星时则是基于地球相对于遥远星星的自转。因此，一个恒星日大约为23小时56分钟和4秒，略短于我们通常使用的太阳日。为了理解地方恒星时的重要性，可以考虑天文学家如何利用它来定位星星和其他天体。当天文学家想要观察特定星星时，他们必须知道那颗星星在天空中的最高点，即极大值何时出现。这个时刻可以通过地方恒星时准确预测，从而允许他们精确规划观测。例如，如果一颗星星在晚上10点地方恒星时达到极大值，观察者就知道在那个时间准备好，以便最佳地看到这颗星星。此外，地方恒星时因观察者的经度而异。地球上的每个观察者都有不同的地方恒星时，因为地球围绕其轴自转，导致不同的星星在不同的时间出现在夜空中。这种变化就是为什么天文学家通常在协调不同地点的观测时，将地方恒星时转换为世界时间。此外，地方恒星时的应用不仅限于天文学。它在导航中也发挥着重要作用，特别是在天体导航中。水手和飞行员使用地方恒星时通过观察星星来确定他们在地球上的位置。通过了解地方恒星时，他们可以计算自己的经度，并确保他们在正确的航线上。这种导航方法已经使用了几个世纪，至今仍然相关，展示了理解地方恒星时的重要性。总之，地方恒星时是天文学和导航中的一个基本概念，它允许准确追踪天体和地球上的位置。它依赖于星星而非太阳，为时间计量提供了独特的视角，这对这些领域的专业人士至关重要。无论是计划天文观测还是在海上航行，理解地方恒星时仍然是我们与宇宙互动的关键组成部分。随着我们技术的进步和对空间探索的深入，掌握像地方恒星时这样的概念将继续对未来的发现和创新至关重要。