Flickr & astrotags

We've teamed up with photo-sharing site Flickr to form a vibrant group of astronomy photographers.
Showcasing what’s going on, from pictures that have caught our eye to the latest astrotags.
Long before Google Sky, Royal Observatory astronomers marked 40 million stars on a sky map.
What are astrotags, how do you add them to photos and why should you bother?
A brief guide to all the tags and what they mean.
Astrometry concerns the measurement of the positions, motions, and brightness of celestial objects.
We really want developers to get your hands on astrotags and see what it's possible to do with them.