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ITIS

Integrated Taxonomic Information System

https://www.itis.gov/ws_descripti...
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Launch Library 2

Spaceflight launches and events database

https://thespacedevs.com/llapi
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Materials Platform for Data Science

Curated experimental data for materials science

https://mpds.io
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Minor Planet Center

Asterank.com Information

http://www.asterank.com/mpc
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NASA

NASA data, including imagery

https://api.nasa.gov
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NASA ADS

NASA Astrophysics Data System

https://ui.adsabs.harvard.edu/hel...
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Newton

Symbolic and Arithmetic Math Calculator

https://newton.vercel.app
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Noctua

REST API used to access NoctuaSky features

https://api.noctuasky.com/api/v1/...
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Numbers

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

https://math.tools/api/numbers/
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Ocean Facts

Facts pertaining to the physical science of Oceanography

https://oceanfacts.herokuapp.com/
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Open Notify

ISS astronauts, current location, etc

http://open-notify.org/Open-Notif...
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Open Science Framework

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

https://developer.osf.io
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Purple Air

Real Time Air Quality Monitoring

https://www2.purpleair.com/
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Remote Calc

Decodes base64 encoding and parses it to return a solution to the calculation in JSON

https://github.com/elizabethadegb...
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SHARE

A free, open, dataset about research and scholarly activities

https://share.osf.io/api/v2/
SpaceX Icon
SpaceX

Company, vehicle, launchpad and launch data

https://github.com/r-spacex/Space...
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Sunrise and Sunset

Sunset and sunrise times for a given latitude and longitude

https://sunrise-sunset.org/api
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Times Adder

With this API you can add each of the times introduced in the array sended

https://github.com/FranP-code/API...
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TLE

Satellite information

https://tle.ivanstanojevic.me/#/d...
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USGS Earthquake Hazards Program

Earthquakes data real-time

https://earthquake.usgs.gov/fdsnw...
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USGS Water Services

Water quality and level info for rivers and lakes

https://waterservices.usgs.gov/