A day is how long it takes the sun to come back overhead.

一天是太陽從頭頂繞一圈返回頭頂所需的時間，

Doesn’t happen on the sun, unless you’re standing upside down, in which case days on

這在太陽上不會發生，除非你倒立，如此一來

the sun are infinitesimally short and your hair is on fire.

太陽上的一天將會無限短，而你的頭髮會燒毀。

But maybe a day is how long it takes to spin around relative to the distant stars, in which

但也許一天可算做以遙遠恆星為基準的自轉時間，

case different parts of the sun have different days because it’s a big ball of flowing,

於是太陽不同部分的一天將會不一樣長， 畢竟太陽是一大團流動的

gassy plasma and different parts rotate at different rates: relative to distant stars,

氣狀電漿，不同區域可以有不同轉速。 相對於遙遠的恆星，

the sun’s equator rotates once every 24 and a half earth days, while near the poles

太陽赤道自轉一次約24.5個地球日，靠近極區

it rotates roughly every 34 earth days.

自轉一周則需34個地球日。

Or maybe a day is simply eighty six thousand and four hundred seconds, in which case a

或要說一個地球日是86400秒，而太陽上的一天

day on the sun is slightly longer than a day on the earth due to gravitational time dilation.

將會比地球日略長，因為強大的重力使時間減緩。

Or maybe a day is the time a human can survive without breathing, times 360, in which case

或者說一天是人類不呼吸能存活的時間乘以360，

a day on the sun is… definitely your last.

這樣太陽上的一天就是......你的末日囉。