precession in declination

简明释义

赤纬岁差

英英释义

例句

1.The effects of precession in declination 天球赤纬的进动 can be observed in the changing positions of the sun at different times of the year.

可以观察到天球赤纬的进动对一年中不同时间太阳位置变化的影响。

2.Understanding the precession in declination 天球赤纬的进动 is crucial for accurate celestial navigation.

理解天球赤纬的进动对于准确的天文导航至关重要。

3.Due to the precession in declination 天球赤纬的进动, navigators must adjust their charts regularly.

由于天球赤纬的进动，导航员必须定期调整他们的航海图。

4.Scientists study the precession in declination 天球赤纬的进动 to better understand climate patterns over millennia.

科学家研究天球赤纬的进动以更好地理解千年气候模式。

5.The astronomer explained how the precession in declination 天球赤纬的进动 affects the position of stars over centuries.

天文学家解释了如何影响星星位置的天球赤纬的进动。

作文

The concept of precession in declination is fundamental to our understanding of celestial navigation and the movement of the Earth in relation to the stars. To grasp this idea, one must first understand what declination means in an astronomical context. Declination is the angular distance of a point north or south of the celestial equator, similar to latitude on Earth. As the Earth rotates and orbits the Sun, the position of stars in the sky appears to shift, which is where precession in declination comes into play.Precession refers to the gradual change in the orientation of an astronomical body's rotational axis. In the case of Earth, it is influenced by gravitational forces exerted by the Sun and the Moon. Over time, these forces cause the Earth's axis to wobble slightly, leading to a slow, cyclical movement of the celestial poles. This phenomenon affects the declination of stars, causing them to appear to move over long periods.Historically, ancient civilizations relied heavily on the positions of stars for navigation and agricultural planning. As they observed the night sky, they would notice that certain stars were moving ever so slightly from their original positions. This observation was an early indication of what we now know as precession in declination. The ancient Greeks, for instance, documented these shifts, but it wasn't until later that astronomers like Hipparchus and Ptolemy began to quantify these changes.In modern astronomy, the effects of precession in declination are significant. The North Star, Polaris, is not fixed in the sky; rather, its position changes due to this precession. Currently, Polaris is located nearly at the North Celestial Pole, but thousands of years ago, it was not in such a prominent position. As the Earth continues to precess, other stars will take its place as the pole star over millennia.Understanding precession in declination is not only important for astronomers but also for navigators who use celestial bodies for orientation. As the positions of stars change, navigators must adjust their calculations to ensure accurate positioning. This is particularly crucial for maritime navigation, where precise positioning can mean the difference between safe passage and disaster.Furthermore, the implications of precession in declination extend beyond navigation. They also affect our understanding of climate patterns and the Earth's axial tilt, which plays a role in seasonal changes. The slow wobble of the Earth influences long-term climate cycles, known as Milankovitch cycles, which are linked to ice ages and other significant climatic events.In conclusion, the term precession in declination encapsulates a complex yet fascinating aspect of astronomy that has intrigued humans for centuries. From ancient navigators to modern astronomers, the understanding of how the Earth’s axis wobbles and affects the positions of stars is vital for both practical applications and scientific inquiry. As we continue to explore our universe, the study of precession in declination will remain a key area of interest, shedding light on the dynamic nature of our celestial surroundings.

“declination的进动”这一概念对于我们理解天体导航和地球与恒星之间的运动至关重要。要掌握这个概念，首先必须了解在天文学背景下的declination意味着什么。Declination是指一个点相对于天球赤道的南北角度距离，类似于地球上的纬度。当地球自转并围绕太阳公转时，星星在天空中的位置似乎会发生变化，而这就是declination的进动发挥作用的地方。进动是指天体旋转轴方向的逐渐变化。在地球的情况下，它受到太阳和月球施加的引力的影响。随着时间的推移，这些力量导致地球的轴心轻微摇摆，从而导致天球极点的缓慢周期性运动。这一现象影响了恒星的declination，导致它们在长时间内似乎发生移动。从历史上看，古代文明在导航和农业规划中严重依赖恒星的位置。当他们观察夜空时，会注意到某些星星从原来的位置上稍微移动。这种观察是我们现在所知道的declination的进动的早期迹象。例如，古希腊人记录了这些变化，但直到后来，像希帕恰斯和托勒密这样的天文学家才开始量化这些变化。在现代天文学中，declination的进动的影响是显著的。北极星Polaris并不是固定在天空中的；相反，由于这种进动，它的位置在变化。目前，Polaris几乎位于北天极，但在数千年前，它并没有如此显著的位置。随着地球继续进动，其他星星将在千年间取代它的位置。理解declination的进动不仅对天文学家重要，对利用天体进行定位的导航员也同样重要。随着星星位置的变化，导航员必须调整他们的计算，以确保准确定位。这在海洋导航中尤其关键，精确的定位可能意味着安全通行与灾难之间的差异。此外，declination的进动的影响超越了导航。它们还影响我们对气候模式和地球轴倾斜的理解，后者在季节变化中起着作用。地球的缓慢摇摆影响着长期气候周期，称为米兰科维奇周期，这与冰河时期和其他重大气候事件有关。总之，术语declination的进动概括了一个复杂而迷人的天文学方面，几个世纪以来一直吸引着人类。从古代的导航员到现代的天文学家，理解地球的轴心如何摇摆以及如何影响恒星的位置对于实际应用和科学探究都是至关重要的。随着我们继续探索宇宙，declination的进动的研究将仍然是一个关键的兴趣领域，揭示我们天体环境的动态本质。