From the December 2010 issue

Tony Hallas’ Cosmic Imaging: The fine art of dithering

February 2011: Moving your images around offers distinct advantages.
By | Published: December 27, 2010 | Last updated on May 18, 2023
A wide swath of the Milky Way in the constellations Serpens and Sagittarius shows the effect after the author dithered, aligned, and combined 12 wide-angle shots from a digital single-lens reflex camera on a mount he moved slightly between each exposure.
Tony Hallas

Within the context of astroimaging, dithering our images means moving them around slightly between each exposure. And a good reason exists for us to do this.