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词汇 Parallax method
分类 英语词汇 英语翻译词典
释义

Parallax method

原声例句
VOA常速英语_欧洲

Scientists hail Gaia's mapping work as crucial to the parallax method, which compares the difference in the direction a star appears to be traveling depending on where on earth it is viewed.

科学家们称盖亚的制图工作对视差法至关重要，视差法比较了在地球上的不同位置观察，一颗恒星所显示的行进方向的差异。

中文百科

视差 Parallax

（重定向自Parallax method）
由于观察点的改变，一个物体相对于远方背景的移动，显示视差的简化插图。当从
这是视差的动画示例。随着观测点从一测移至另一侧，远方物体的移动比接近相机的物体缓慢。
这张图像演示视差。太阳位于路灯的上方，太阳和路灯在水中的倒影是虚像。虚像的位置是在水面的下方，提供了一个不同的点瞭望路灯，显示出相对于太阳的位置有了改变。
恒星视差运动

视差是从两个不同的点查看一个物体时，视位置的移动或差异，量度的大小位是这两条线交角的角度或半角度。这个名词是源自希腊文的παράλλαξις（parallaxis），意思是"改变"。从不同的位置观察，越近的物体有着越大的视差，因此视差可以确定物体的距离。

从目标看两个点之间的夹角，叫做这两个点的视差角，两点之间的距离称作基线。

天文学家使用视差的原理测量天体的距离，包括月球、太阳、和在太阳系之外的恒星。例如，依巴谷卫星测量了超过100,000颗邻近恒星的距离。这为天文学提供了测量宇宙距离尺度的阶梯，是其它测距方法的基础。在此处，"视差"这个名词是两条到恒星的视线交角的角度或半角度。

英语百科

Parallax 视差

（重定向自Parallax method）
A simplified illustration of the parallax of an object against a distant background due to a perspective shift. When viewed from
This animation is an example of parallax. As the viewpoint moves side to side, the objects in the distance appear to move more slowly than the objects close to the camera.
This image demonstrates parallax. The Sun is visible above the streetlight. The reflection in the water is a virtual image of the Sun and the streetlight. The location of the virtual image is below the surface of the water, offering a different vantage point of the streetlight, which appears to be shifted relative to the more distant Sun.
Parallax is an angle subtended by a line on a point. In the upper diagram the earth in its orbit sweeps the parallax angle subtended on the sun. The lower diagram shows an equal angle swept by the sun in a geostatic model. A similar diagram can be drawn for a star except that the angle of parallax would be minuscule.

Parallax is a displacement or difference in the apparent position of an object viewed along two different lines of sight, and is measured by the angle or semi-angle of inclination between those two lines. The term is derived from the Greek word παράλλαξις (parallaxis), meaning "alteration". Due to foreshortening, nearby objects have a larger parallax than more distant objects when observed from different positions, so parallax can be used to determine distances.
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