The International Astronomical Union (IAU) is a principal organization dedicated to promoting and advancing the science of astronomy globally. Boasting an array of offerings that cater to the field of astronomy, this organization ensures that members have up-to-date information and resources at their disposal.

On their website, you'll find a detailed presentation of their respective divisions, each with distinct scientific objectives. These include Division A (Fundamental Astronomy), Division B (Facilities, Technologies and Data Science), Division C (Education, Outreach and Heritage), Division D (High Energy Phenomena and Fundamental Physics), Division E (Sun and Heliosphere), and Division F (Planetary Sciences and Bioastronomy). Each division has its own homepage with specific information about its objectives, commissions, working groups, news, meetings, and division members' documents.

IAU remains actively involved in the scientific community by consistently publishing press releases and announcements dating back to the year 1999, thus maintaining an extensive archive that serves as a rich source of information for researchers and enthusiasts alike.

The IAU's website also houses resources such as newsletters, image archives and a dedicated press room. IAU in the Media serves as a related hub for press contacts and updates about the IAU's engagement with various media outlets.

Moreover, the IAU prioritizes keeping its members informed and engaged by providing informative updates on dates and deadlines that are vital for the administrative and scientific schedules. They also provide updates on planetary surface feature news, and allow for the submission of news proposals by members.

Furthermore, the IAU values page outlines the organization's commitment to promoting astronomy through international collaborations. The option to donate is present for those who wish to support the work of the IAU.

Members are afforded with an easy-to-use login system for easy access to the member directory. This feature offers connectivity and fosters a sense of community within the IAU membership. Additionally, the website also provides a clear sitemap and straightforward contact details for effective communication.

Verdict: the International Astronomical Union (IAU) facilitates scientific study, research, and discourse within the field of astronomy. Their website serves as a comprehensive source of information for their members and the wider astronomy community. Offering an array of resources, alongside important updates, the IAU remains steadfast in their support of global astronomy efforts.