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AstronomyAPI

Science Data Free key (no card)

AuthenticationFree key (no card)
Rate limitFree plan has a daily quota; aggressive use is throttled (429s). Cache results

Documentation: docs.astronomyapi.com ยท Checked Sep 13, 2026

About

Calculate where planets, the Moon, and stars are for any place and time. Moon phases, planetary positions, rise/set times, and printable star charts. Free accounts get an application ID and secret used with HTTP Basic Auth.

Details

Free to start. You may need a free key, but no credit card.

Auth: Free key (no card)

Rate limit: Free plan has a daily quota; aggressive use is throttled (429s). Cache results

Verified: 2026-09-13

Best for: astronomy apps photographers education

Read the docs Back to catalog

Setup

  1. Create a free account at astronomyapi.com
  2. Copy your application ID and secret from the console
  3. Call endpoints with HTTP Basic Auth using ID as username and secret as password
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