Open Ephemeris

Sub-arcsecond planetary positions, natal charts, transits, and Human Design from NASA JPL DE440

Official docs outline

Extra Credit builds an outline of Open Ephemeris's docs the first time your work uses it. Until then, start at the official documentation.

Newton Symbolic and Arithmetic Math Calculator
Noctua REST API used to access NoctuaSky features
Numbers Number of the day, random number, number facts and anything else you want to do with numbers
OBIS Global marine species occurrence and distribution data
Ocean Facts Facts pertaining to the physical science of Oceanography
Oliver's mTOR Atlas Curated mTOR research: studies by evidence type, pathway claims, open questions
Open Notify ISS astronauts, current location, etc
Open Science Framework Repository and archive for study designs, research materials, data, manuscripts, etc
OpenAlex Open catalog of scholarly works, authors, institutions, sources, and concepts
OrbitalWiki Catalog of 16,000+ satellites merging CelesTrak, GCAT, Wikidata; free tier included
Purple Air Real Time Air Quality Monitoring
RCSB PDB 3D structures of proteins and nucleic acids