Terms of Service & Citation Guidelines
1. Creative Commons Open Access (CC-BY 4.0)
Unless explicitly noted otherwise, all original text, theoretical derivations, reduced spectrum plots, and educational simulators produced by the Harvard Center for Astrophysics are licensed under the Creative Commons Attribution 4.0 International License (CC-BY 4.0). You are free to share and adapt the material for any purpose, including commercial projects, provided appropriate credit is given.
2. Academic Citation Format
When referencing datasets, reductions, or tools from this portal in scientific literature or academic papers, please utilize the following standardized citation format:
3. API Usage Fair Use Policy
Access to our REST and GraphQL APIs is provided free of charge. Users are requested to respect the default rate limit of 10,000 requests/hour and cache static ephemeris queries where appropriate. Automated scraping that degrades server availability for the research community may result in temporary IP throttling.