sidereal day

简明释义

恒星日

英英释义

例句

1.A sidereal day 恒星日 is approximately 23 hours, 56 minutes, and 4 seconds long.

一个sidereal day 恒星日大约是23小时56分钟和4秒长。

2.Astronomers use the concept of a sidereal day 恒星日 to measure the rotation of the Earth relative to distant stars.

天文学家使用sidereal day 恒星日的概念来测量地球相对于遥远星体的自转。

3.When planning observations, it's essential to account for the sidereal day 恒星日 to ensure accurate timing.

在计划观测时，考虑sidereal day 恒星日以确保准确计时是至关重要的。

4.The difference between a solar day and a sidereal day 恒星日 can affect satellite positioning.

太阳日与sidereal day 恒星日之间的差异可能会影响卫星定位。

5.A sidereal day 恒星日 is the time it takes for the Earth to rotate once on its axis relative to the stars.

一个sidereal day 恒星日是地球相对于星星自转一次所需的时间。

作文

The concept of a sidereal day is essential for understanding the astronomical measurements of time. Unlike the solar day, which is based on the Earth's rotation relative to the Sun, a sidereal day measures the Earth's rotation in relation to distant stars. This distinction is crucial for astronomers and navigators who require precise timekeeping based on celestial observations.A sidereal day lasts approximately 23 hours, 56 minutes, and 4 seconds. This duration reflects the time it takes for the Earth to complete one full rotation on its axis relative to the background stars. In contrast, a solar day is about 24 hours long, which accounts for the additional time needed for the Earth to rotate slightly more than one full turn to align with the Sun again due to its orbit around the Sun. This discrepancy results from the elliptical shape of the Earth's orbit and its axial tilt.Understanding the difference between a sidereal day and a solar day is not only fascinating but also practical. For instance, when planning astronomical observations, scientists must account for the sidereal day to ensure they are observing celestial bodies at the correct times. Telescopes often need to be adjusted based on this measurement to track stars accurately as they move across the night sky.Furthermore, the concept of a sidereal day extends beyond astronomy into various fields such as navigation and satellite communication. Navigators rely on precise measurements of time to determine their positions at sea, and understanding the sidereal day helps them make accurate calculations. Similarly, satellites in orbit around the Earth use this timing to maintain their positions and communicate effectively with ground stations.In addition to its practical applications, the sidereal day invites us to ponder our place in the universe. It reminds us that our perception of time is influenced by our position within the cosmos. While we may measure days based on the Sun's journey across the sky, the reality is that the universe operates on a much grander scale. The sidereal day represents a more universal standard of time that transcends our earthly experiences.In conclusion, the sidereal day is a fundamental concept that enriches our understanding of time and space. It highlights the intricate relationship between the Earth and the cosmos, offering insights into the mechanics of our universe. Whether for scientific purposes or philosophical contemplation, the sidereal day serves as a reminder of the vastness of time and the importance of precision in our measurements of the world around us.

“恒星日”这一概念对于理解天文时间测量至关重要。与基于地球相对于太阳的自转的太阳日不同，“恒星日”是指地球相对于遥远恒星的自转时间。这一区别对天文学家和需要精确时间记录的导航员来说非常重要，因为他们需要基于天体观测进行准确的时间计算。一个“恒星日”大约持续23小时56分钟4秒。这一时长反映了地球在其轴上完成一次完整自转相对于背景恒星所需的时间。相较之下，太阳日约为24小时，这一差异考虑了地球在围绕太阳公转过程中，重新与太阳对齐所需的额外时间。这种差异源于地球轨道的椭圆形状及其轴倾角。理解“恒星日”和太阳日之间的区别不仅令人着迷，而且具有实用意义。例如，在计划天文观测时，科学家必须考虑“恒星日”，以确保他们在正确的时间观察天体。望远镜通常需要根据这一测量进行调整，以准确跟踪夜空中移动的星星。此外，“恒星日”的概念还延伸到导航和卫星通信等多个领域。导航员依赖于精确的时间测量来确定他们在海上的位置，而理解“恒星日”有助于他们进行准确的计算。同样，环绕地球的卫星使用这种时间来维持其位置并有效地与地面站通信。除了实用应用之外，“恒星日”还邀请我们思考我们在宇宙中的位置。它提醒我们，我们对时间的感知受到我们在宇宙中的位置的影响。尽管我们可能根据太阳在天空中的运动来测量白天，但现实是宇宙在更宏大的尺度上运作。“恒星日”代表了一种超越我们地球体验的更普遍的时间标准。总之，“恒星日”是一个基本概念，丰富了我们对时间和空间的理解。它突显了地球与宇宙之间复杂的关系，为我们提供了对宇宙机制的深刻见解。无论是出于科学目的还是哲学思考，“恒星日”都提醒我们时间的广阔以及我们对周围世界测量的精确性的重要性。