Welcome to OpenAstronomyLog, a free and open XML schema definition for all kinds of astronomical observations.  Software that supports this schema enables an observer to share observations with other observers or move observations among software products.

The schema (formerly known as COMAST schema) was primarily developed by the German "Fachgruppe für Computerastronomie" (section for computerastronomy) which is a subsection of Germany's largest astronomy union, VDS  (Vereinigung der Sternfreunde e.V.) 
Starting with version 2.0 the schema was renamed from COMAST (abbr. for Computer Astronomy) to OpenAstronomyLog (or short <OAL>).

The schema is released under the APACHE Software License 2.0 and is currently supported in both open source and commercial software.

Observers:  Join the group to learn about OpenAstronomyLog and post questions for other users (List of applications supporting <OAL>).

Please note that this site is not intended to collect your observations! Our mission is to develop the standards for applications that can be used to register, browse and share observations online and offline.

Developers: Join the group to post questions for other developers and get help adding support for OpenAstronomyLog to your software (please see our Compliance Guidelines).