arcsecond.io
Science & Math
Multiple astronomy data sources
No keyCORSHTTPS
Open Ephemeris
Sub-arcsecond planetary positions, natal charts, transits, and Human Design from NASA JPL DE440
API key
Required
HTTPS
Supported
Browser calls
No, needs a proxy
Status
Not yet checked
How to call it
A starting template for Open Ephemeris. Replace ENDPOINT with the path from the official documentation, which we link above rather than guess at.
# Requires an API key. Check the docs for whether it goes in a header or a query parameter.
curl -s "https://openephemeris.com/ENDPOINT" \
-H "Authorization: Bearer YOUR_API_KEY" \
-H "Accept: application/json"This API does not send CORS headers, so a browser will block a direct call from your front end. Call it from your server, or put a small proxy in front of it.
Where this listing comes from
Aggregated from one public source (public-apis), then normalised and checked by us.
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Open Ephemeris — common questions
Answered from what our own scheduled checks found, not from the provider's marketing.
Is Open Ephemeris free to use?
Open Ephemeris is listed in our free catalogue, but it requires an API key, so you will need to register before your first call. Providers frequently reserve higher limits and commercial use for paid plans.
Does Open Ephemeris need an API key?
Yes. Open Ephemeris authenticates with an API key. Keep it server-side rather than in browser code, because anything in your frontend bundle is readable by anyone who opens developer tools.
Can I call Open Ephemeris from browser JavaScript?
Not directly. Open Ephemeris did not return CORS headers when we checked, so the browser will block your page from reading the response even though the request itself succeeds. Call it from a server, or put a small proxy in front of it.
Is Open Ephemeris available over HTTPS?
Yes. Open Ephemeris serves over HTTPS, so you can call it from a secure page without triggering a mixed-content block.