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词汇 Apparent sun
分类 英语词汇 英语翻译词典
释义

Apparent sun

中文百科

太阳日 Solar time

（重定向自真太阳）
在顺行轨道上的行星，像是地球，恒星日会比太阳日短。如图：在时间1，一颗遥远的恒星和太阳都在正上方；在时间2，行星转了360°，遥远的恒星在正上方（1→2 =恒星日），但是要再晚一点，在时间3的位置上太阳才会在正上方（1→3 =太阳日）。
The equation of time—above the axis a sundial will appear fast relative to a clock showing local mean time, and below the axis a sundial will appear slow.
Sun and Moon, Nuremberg Chronicle, 1493

太阳日（英语：solar day）是依据太阳运动，所定义的时间，可以分为视太阳日和平太阳日。

一太阳日传统称为一“日”、一“天”或一“昼夜”。

视太阳日是依据真太阳定义的，也就是真实的太阳连续两次经过某地相同之中天，即是上至上中天或下至下中天的时间间隔，可以使用日晷来测量（上中天）。

由于以下两个原因，视太阳日在一年当中的长度会每天不停地改变。

英语百科

Solar time 太阳日

（重定向自Apparent sun）
On a prograde planet like the Earth, the sidereal day is shorter than the solar day. At time 1, the Sun and a certain distant star are both overhead. At time 2, the planet has rotated 360° and the distant star is overhead again (1→2 = one sidereal day). But it is not until a little later, at time 3, that the Sun is overhead again (1→3 = one solar day). More simply, 1-2 is a complete rotation of the Earth, but because the revolution around the Sun affects the angle at which the Sun is seen from the Earth, 1-3 is how long it takes noon to return.
The equation of time—above the axis a sundial will appear fast relative to a clock showing local mean time, and below the axis a sundial will appear slow.
Sun and Moon, Nuremberg Chronicle, 1493

Solar time is a reckoning of the passage of time based on the Sun's position in the sky. The fundamental unit of solar time is the day. Two types of solar time are apparent solar time (sundial time) and mean solar time (clock time).
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