sidereal time

简明释义

恒星时

英英释义

例句

1.The sidereal time helps in determining the position of stars in the night sky.

恒星时间有助于确定夜空中星星的位置。

2.Observatories often adjust their telescopes based on sidereal time readings.

天文台通常根据恒星时间的读数来调整望远镜。

3.To navigate using the stars, sailors must understand sidereal time.

为了利用星星导航，水手必须理解恒星时间。

4.Astronomers use sidereal time to track celestial events more accurately.

天文学家使用恒星时间来更准确地追踪天体事件。

5.The concept of sidereal time is crucial for astrophysics research.

恒星时间的概念对于天体物理研究至关重要。

作文

Understanding the concept of sidereal time is essential for various fields, including astronomy and navigation. Sidereal time is a measurement of time based on the position of stars in the sky, rather than the position of the sun. This distinction is crucial because while our clocks measure solar time—based on the Earth's rotation relative to the sun—sidereal time accounts for the fact that the Earth is also orbiting around the sun. As a result, a day measured in sidereal time is approximately 23 hours, 56 minutes, and 4 seconds long, which is slightly shorter than the solar day we commonly use.The significance of sidereal time becomes apparent when we consider its applications in astronomy. Astronomers rely on sidereal time to track celestial objects accurately. For instance, when observing a star, astronomers must know the exact time in sidereal time to ensure that they are looking at the right position in the sky. This precision is necessary because the stars appear to move across the sky as the Earth rotates and orbits the sun.Additionally, sidereal time is vital for the operation of telescopes. Many telescopes are equipped with mounts that can be aligned to follow the motion of celestial bodies. These mounts often use sidereal time to calculate the necessary adjustments to keep the telescope pointed at a specific star or planet as the Earth rotates. Without this accurate timekeeping, observations could easily become misaligned, leading to inaccurate data collection.In navigation, sidereal time plays a key role as well. Historically, sailors used the stars to navigate the seas. By knowing the sidereal time, navigators could determine their longitude by comparing the local time (based on the sun) to the sidereal time. This method allowed them to pinpoint their location more accurately than relying solely on solar time. Although modern technology has largely replaced these methods, understanding sidereal time remains important for comprehending the principles of celestial navigation.Moreover, sidereal time has implications beyond practical applications; it also enriches our understanding of the universe. The concept challenges us to think about time not just as a linear progression but as a complex interplay of celestial mechanics. It reminds us that our perception of time is influenced by our position in the cosmos and our relationship with other celestial bodies.In conclusion, sidereal time is a fundamental concept that enhances our understanding of both astronomy and navigation. Its applications in tracking celestial objects and navigating the seas highlight the importance of this measurement in historical and modern contexts. As we continue to explore the universe, the significance of sidereal time will undoubtedly remain a vital aspect of our astronomical and navigational endeavors. Understanding sidereal time not only deepens our knowledge of the cosmos but also invites us to appreciate the intricate mechanisms that govern our world and beyond.

理解恒星时间的概念对于天文学和导航等多个领域至关重要。恒星时间是一种基于天空中星体位置的时间测量，而不是基于太阳的位置。这一区别非常重要，因为我们的时钟测量的是太阳时间——基于地球相对于太阳的自转——而恒星时间则考虑到地球也在围绕太阳公转。因此，使用恒星时间测量的一天大约是23小时56分钟4秒，比我们通常使用的太阳日略短。恒星时间的重要性在于其在天文学中的应用。天文学家依赖恒星时间来准确追踪天体。例如，在观察一颗星星时，天文学家必须知道确切的恒星时间，以确保他们正在观察天空中的正确位置。这种精确性是必要的，因为随着地球的自转和围绕太阳的公转，星星似乎在天空中移动。此外，恒星时间对望远镜的操作至关重要。许多望远镜配备了可以调整以跟踪天体运动的支架。这些支架通常使用恒星时间来计算所需的调整，以保持望远镜指向特定的星星或行星。没有这种准确的时间记录，观察可能会轻易失去对准，导致数据收集不准确。在导航中，恒星时间也发挥着关键作用。历史上，水手们利用星星在海上导航。通过知道恒星时间，导航员可以通过将当地时间（基于太阳）与恒星时间进行比较来确定他们的经度。这种方法使他们能够比仅依靠太阳时间更准确地定位。尽管现代技术在很大程度上取代了这些方法，但理解恒星时间仍然对理解天体导航的原理至关重要。此外，恒星时间不仅具有实际应用的意义；它也丰富了我们对宇宙的理解。这个概念挑战我们思考时间不仅仅是一种线性进程，而是天体力学的复杂相互作用。它提醒我们，我们对时间的感知受到我们在宇宙中的位置和与其他天体的关系的影响。总之，恒星时间是一个基本概念，增强了我们对天文学和导航的理解。它在追踪天体和海洋导航中的应用突显了这种测量在历史和现代背景下的重要性。随着我们继续探索宇宙，恒星时间的意义无疑将继续成为我们天文和导航努力的重要方面。理解恒星时间不仅加深了我们对宇宙的认识，也邀请我们欣赏支配我们世界及其超越的复杂机制。