###车遥遥篇 宋·范成大 车遥遥，马憧憧。 君游东山东复东，安得奋飞逐西风。 愿我如星君如月，夜夜流光相皎洁。 月暂晦，星长明。 留明待月复，三五共盈

###前言： ​ 搭建个人blog这个想法早在1年前就有了，直到最近这半个月看了一些视频教程and文字教程，才一步一步的搭建好最简单的样式。一开

Motivation 假设$f(x)$在$x_0$处具有n阶导数，是否可以找出一个关于$(x-x_0)$的n次多项式来近似表达函数$f(x_0)$的值？ 即，$f

$\color{red}{K-correction }$: it converts measurements of astronomical objects into $\color{red}{their\ respective\ rest\ frames}$. The correction acts on that object’s observed $\color{red}{magnitude}$ (or equivalently, its flux). Why should appeal to K-correction? Because astronomical observation often measure through a single filter or bandpass, observers only measure a fraction of the total spectrum, redshifted into the frame of the observer. Formula $K_{corr}=(m-M)-5(log_{10}D_L-1)$ Where, ​ $D_L$ is the luminosity distance measured in parsecs ​

Luminosity $\color{red}{Luminosity}$ is an absolute measure of radiated of electromagnetic power, the radiant power emitted by a light-emitting object. $\color{red}{Particularly\ in\ astronomy}$, luminosity is the total amount of electromagnetic energy emitted per unit of time by a star, galaxy or other astronomical object. Flux density $F={L\over A}={L\over 4\pi r^2}$ Where, ​ A is the area of the illuminated surface ​ F is the flux density of the illuminated surface ​

踏莎行 姜夔 自沔东来，丁末元日至金陵，江上感梦而作 燕燕轻盈，莺莺娇软，分明又向华胥见。夜长争得薄情知，春初早被相思染。 别后书辞，别时针线，离魂