Greenwich sidereal noon

简明释义

格林恒星正午

英英释义

例句

1.The astronomer noted that the star's position was best observed at Greenwich sidereal noon, which is 格林威治恒星正午.

天文学家注意到，在格林威治恒星正午，最佳观察星星的位置，格林威治恒星正午是指格林威治恒星正午.

2.Understanding Greenwich sidereal noon is crucial for astronomers, as it represents 格林威治恒星正午.

理解格林威治恒星正午对天文学家来说至关重要，因为它代表了格林威治恒星正午.

3.During the lecture, the professor explained the significance of Greenwich sidereal noon in celestial navigation, which translates to 格林威治恒星正午.

在讲座中，教授解释了格林威治恒星正午在天文导航中的重要性，翻译为格林威治恒星正午.

4.To accurately set their telescope, the team waited for Greenwich sidereal noon, or 格林威治恒星正午.

为了准确设置他们的望远镜，团队等待了格林威治恒星正午，或称为格林威治恒星正午.

5.The satellite's position was calculated based on Greenwich sidereal noon, known in Chinese as 格林威治恒星正午.

卫星的位置是基于格林威治恒星正午计算的，在中文中称为格林威治恒星正午.

作文

Understanding the concept of time is fundamental to our daily lives, yet it can be surprisingly complex. One of the more intricate aspects of timekeeping is the distinction between solar time and sidereal time. Among these terms, Greenwich sidereal noon holds a significant place in astronomy and navigation. To fully appreciate its importance, we must first delve into what sidereal time is and how it differs from solar time. Sidereal time is based on the Earth's rotation relative to distant celestial objects, particularly stars. Unlike solar time, which is measured by the position of the Sun in the sky, sidereal time considers the position of stars. This means that a sidereal day is approximately 23 hours, 56 minutes, and 4 seconds long, making it about four minutes shorter than a solar day. The reason for this discrepancy lies in the Earth's orbit around the Sun; as the Earth travels, it takes a little extra time for the Sun to return to the same position in the sky. Now, when we talk about Greenwich sidereal noon, we are referring to a specific moment in time when the vernal equinox crosses the Greenwich meridian. This point marks the transition from one sidereal day to the next at the Royal Observatory in Greenwich, London, which is the prime meridian (0 degrees longitude). At Greenwich sidereal noon, the celestial reference point known as the First Point of Aries is at its highest point in the sky for observers located at Greenwich. This is a crucial reference point for astronomers and navigators alike, as it helps them determine the positions of stars and planets in relation to Earth.For astronomers, understanding Greenwich sidereal noon is essential for accurate star mapping and celestial navigation. By knowing the exact time of Greenwich sidereal noon, they can calculate the positions of celestial bodies and predict their movements. This knowledge is not only vital for scientific research but also for practical applications such as satellite positioning and space exploration.In navigation, especially before the advent of modern technology, sailors relied heavily on celestial navigation. Knowing the time of Greenwich sidereal noon allowed them to determine their longitude accurately. By comparing the local time with sidereal time, they could calculate their position at sea, which was crucial for safe and efficient travel.In conclusion, Greenwich sidereal noon is more than just a technical term; it represents a pivotal moment in time that has far-reaching implications in the fields of astronomy and navigation. Understanding this concept allows us to appreciate how our ancestors navigated the seas and how modern astronomers continue to explore the universe. As we move forward in an increasingly technology-driven world, the principles behind Greenwich sidereal noon remind us of the fundamental relationship between time and space, a relationship that continues to shape our understanding of the cosmos.

理解时间的概念对我们的日常生活至关重要，然而这可能出乎意料地复杂。在时间计量的众多方面中，太阳时间和恒星时间之间的区别尤为复杂。在这些术语中，格林威治恒星正午在天文学和导航中占有重要地位。要充分理解其重要性，我们首先必须深入探讨恒星时间是什么，以及它与太阳时间的不同之处。恒星时间是基于地球相对于遥远天体，特别是恒星的自转。与通过天空中的太阳位置来测量的太阳时间不同，恒星时间考虑的是恒星的位置。这意味着一个恒星日大约是23小时56分钟04秒，比一个太阳日短约四分钟。这种差异的原因在于地球围绕太阳的轨道；随着地球的运动，太阳需要额外的一点时间才能返回天空中的同一位置。当我们谈论格林威治恒星正午时，我们指的是春分点穿过格林威治子午线的特定时刻。这个时刻标志着在伦敦格林威治皇家天文台，一个恒星日的过渡。此时，称为白羊座第一点的天文参考点在天空中达到其最高点，这对天文学家和导航员来说都是一个重要的参考点，因为它帮助他们确定恒星和行星相对于地球的位置。对于天文学家而言，理解格林威治恒星正午对于准确的星图绘制和天体导航至关重要。通过知道格林威治恒星正午的确切时间，他们可以计算天体的位置并预测其运动。这些知识不仅对科学研究至关重要，而且对卫星定位和太空探索等实际应用也至关重要。在导航中，尤其是在现代技术出现之前，水手们非常依赖天体导航。知道格林威治恒星正午的时间使他们能够准确地确定自己的经度。通过将当地时间与恒星时间进行比较，他们能够计算出自己在海上的位置，这对于安全和高效的旅行至关重要。总之，格林威治恒星正午不仅仅是一个技术术语；它代表了一个关键的时刻，这个时刻在天文学和导航领域具有深远的影响。理解这一概念使我们能够欣赏我们的祖先如何在海上航行，以及现代天文学家如何继续探索宇宙。随着我们在一个越来越依赖技术的世界中前进，格林威治恒星正午背后的原理提醒我们时间与空间之间的基本关系，这一关系继续塑造我们对宇宙的理解。