Public APIs about Science & Math

Multiple astronomy data sources

Curated research-sharing platform: physics, mathematics, quantitative finance, and economics

Daily horoscope info for yesterday, today, and tomorrow

Access the world's Open Access research papers

Global Biodiversity Information Facility

Access millions of museum specimens from organizations around the world

High Energy Physics info. system

Check if a number is even

ISRO Space Crafts Information

Integrated Taxonomic Information System

Spaceflight launches and events database

Curated experimental data for materials science

Asterank.com Information

NASA data, including imagery

Official API for getting APOD (Astronomy Image of the Day) images along with metadata

API for getting APOD (Astronomy Image of the Day) images along with metadata

Symbolic and Arithmetic Math Calculator

Number of the day, random number, number facts and anything else you want to do with numbers

ISS astronauts, current location, etc

Repository and archive for study designs, research materials, data, manuscripts, etc

Real Time Air Quality Monitoring

Query next satellite passes above you

A free, open, dataset about research and scholarly activities

Company, vehicle, launchpad and launch data

Sunset and sunrise times for a given latitude and longitude

Satellite information

Earthquakes data real-time

Water quality and level info for rivers and lakes

World Data

Random mathematical expressions

A Quadratic Solver

NASA Astrophysics Data System