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16th SIRGAS School: “VLBI and SLR Data Processing”

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The 16th SIRGAS School (San Juan, Argentina | Oct 27–Nov 1, 2025) will train professionals in VLBI and SLR data processing, strengthening geodetic capacities in Latin America through theory and practice at the Félix Aguilar Astronomical Observatory. Join us.

Satellite Laser Ranging – How SLR Powers Geodesy

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Discover Satellite Laser Ranging (SLR) – lasers from ground stations measure satellite and Moon positions with millimeter precision. SLR supports the Terrestrial Reference Frame, tracks Earth rotation, tectonic motion, improves gravity and sea level models, and tests relativity. Explore the science behind these precision measurements in our Geodesy Cartoon.

Meeting Summary – Glacial Isostatic Adjustment Workshop 2025

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The 2025 Glacial Isostatic Adjustment Workshop took place June 2–6 in Sidney, BC, Canada, with 136 participants from 23 countries. Topics included Earth rheology, ice sheet dynamics, and sea-level change. Highlights included strong early career researcher participation, a field trip, and new initiatives like a GIA model database and a planned open-source tutorial.

Geodesy Virtual School 2025 – Summary

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The 2025 Geodesy Virtual School focused on reference frames and Earth system monitoring, held in five free online sessions coordinated from Argentina with support from SIRGAS, IAG, IUGG, and others. It featured 37 instructors and global participation, especially from the Americas. All lectures, in English or Spanish with subtitles, are available online, promoting inclusive, high-quality geodetic training worldwide.
Geodesy Cartoon

Lost Without Geodesy

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What happens if geodesy disappears? Phones, planes, and warning systems would fail. Our cartoon “Lost Without Geodesy” shows how vital this invisible science is. Geodesy powers GNSS, enabling precise positioning, earthquake monitoring, sea level studies, and more. Without it, GNSS would drift and global systems would collapse.
REFAG UAW

Call for Abstracts: REFAG2026 – IAG Symposium on Reference Frames for Applications in Geosciences

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The REFAG2026 symposium on reference frames in geosciences will take place in Munich from 2–4 March 2026, followed by the GGOS/IERS UAW. Abstract submissions are open until 15 October 2025. Join us in shaping the future of geodetic reference frames!
Geodesy Cartoon

First Geodesy Cartoon Released

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We’re excited to share the first release in our new cartoon series about geodesy: The New Height of Qomolangma (Mt. Everest). This cartoon offers an engaging and educational look at the long-standing debate between China and Nepal over the…
Gravity quantum gravimeter

New Horizon Europe Project “EQUIP-G” on terrestrial quantum gravimetry

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June 1st was the start of the new Horizon Europe Project “EQUIP-G” Imaging the Earth's interior has always been one of the key challenges in geosciences as it is a prerequisite for understanding our planet's internal dynamics and the coupling…
IAG website

Welcome to the New IAG Website

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We are excited to announce the official launch of the new IAG website geodesy.science. This launch marks a major milestone for the IAG and reflects our ambition to make geodesy more visible, accessible, and connected — both within the scientific…
ESA atomic clock satellite

A new atomic clock in space could help us measure elevations on Earth

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What if we could measure height differences on Earth to the centimeter from space? ESA’s ACES mission on the ISS links ultra-precise atomic clocks in orbit with those on Earth — enabling more accurate global elevation data. This could transform geodesy and help refine height reference systems worldwide.