IERS provides data on Earth rotation, reference systems, and geophysical fluids, with models, standards, and current bulletins.
Earth Orientation Center
The Earth Orientation Center provides Earth orientation time series, reference series, bulletins, and related analysis resources.
About Earth Orientation Center
The Earth Orientation Center publishes Earth orientation time series, reference series, bulletins, and related analysis resources. Its homepage lists series of Earth orientation parameters (EOP), including the Reference C04 series, which covers each day since 1962, and the Reference C01 series, which covers each 0.05 year from 1846.
The site also lists theory and modelling material, such as astro-geodetic techniques, models and software, leap second information, and useful constants. It includes geophysical excitation resources on polar motion, length of day (LOD), and nutation. The homepage text does not describe access limits, update schedules, or licensing terms.
Key features
- Reference C04 Earth orientation series, daily values since 1962
- Reference C01 Earth orientation series, values every 0.05 year from 1846
- Bulletins B, C, and D
- FTP access to EOP products
- Web service for EOP data
- Leap second information and useful constants
Best for: Researchers and analysts in geodesy, astronomy, or geophysics who need historical and current Earth orientation parameter data.
Earth Orientation Center at a glance
- Category
- Research & Data › Open Data & Datasets
- Type
- Website
- Pricing
- Not confirmed. Check the site
- Platforms
- Web
- Open source
- Not stated
- Last checked
- Oct 6, 2026 · Online when checked
- Listed
- Oct 5, 2026
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Earth Orientation Center FAQ
What time span does the Reference C04 series cover?
The homepage describes the Reference C04 series as covering each day since 1962.
What time span does the Reference C01 series cover?
The homepage describes the Reference C01 series as covering each 0.05 year from 1846.
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