气象

气象参数

Air Pressure at Altitude Calculator

Humidity and Dew Point Calculator

辐射

Blackbody Calculator

https://www.spectralcalc.com/

https://www.fxsolver.com/

https://ncc.nesdis.noaa.gov/

https://www.opticsthewebsite.com/

电磁波谱

Interactive electromagnetic spectrum calculator (Source code)

Calculator for the Electromagnetic Spectrum

Electromagnetic Spectrum Calculator

吸收光谱

SpectralCalc.com: High-resolution spectural modeling

Mie散射

Mie Scattering Calculator

地理

Great Circle Distance（两点间大圆距离）

edwilliams.org
35.461357169334335 km, 237.8552516678092°
可选择地理坐标系

GPS Visualizer
35.461 km, 237.737°

OnlineConversion.com
35.42941287326744 km
同时给出Middle point

calculator.net
35.46 km

movable-type.co.uk
以度分秒形式输入坐标点

数学

Mathway | Calculus Problem Solver

https://www.mathway.com/Calculus
在线进行微积分等运算

Online function plot

https://www.desmos.com/

https://www.transum.org/

Quadratic equation（一元二次方程）

keisan.casio.com
1.0E-5形式输入无效。结果图示，可设置有效数字

www.mathsisfun.com
解很小时图示不佳

www.math.com

www.osgeo.cn

过两点的直线方程

PLANETCALC Online calculators

mathwarehouse.com