and on the arms of the Church of England Diocese of Australia in 1836. According to the university, the Latin motto Sidere mens eadem mutato can be translated to "the stars change, the mind remains the same." Francis Merewether, Vice-Chancellor and later Chancellor, in 1857 proposed "Coelum non animum mutant" from Horace (Ep.1.11.27) but after objections changed it to a metrical version including "Sidus" (Star), a neat reference to the Southern Cross and perhaps the Sydney family link with Sir Philip Sidney's "Astrophel (Star-Lover) & Stella (Star)". Author and university alumnus Clive James quipped in his 1981 autobiography that the motto loosely implies "Sydney University is really Oxford or Cambridge laterally displaced approximately 12,000 miles." Student organisations Student Representatives: Politically and academically, undergraduate students are represented by the University of Sydney Students' Representative Council (SRC) and postgraduate students by the Sydney University Postgraduate Representative Association (SUPRA). University of Sydney Union: The University of Sydney Union (USU) is the oldest and largest university union in Australia. USU provides a range of activities, programs, services and facilities geared at giving students the university experience. This involves delivering clubs and societies program, a varied entertainment program, student opportunities, a range of catering and retail services plus buildings and recreational spaces for students, staff and visitors. The SRC and Union are both governed by student representatives, who are elected by students each year. Elections for the USU board of directors occur in first semester; elections for the SRC president, and for members of the Students' Representative Council itself, occur in second semester, along with a separate election for the editorial board of the student newspaper Honi Soit, which is published by the SRC. Charles Perkins Oration and Prize Since 2000, the Dr Charles Perkins Oration has been held by the university, in honour of its first Aboriginal graduate, Charlie Perkins. The orations have been delivered by prominent First Nations people, including Linda Burney, Pat Anderson, Daniel Browning, Mick Gooda and Ken Wyatt. The Oration includes the Charles Perkins Memorial Prize, which recognises the achievements of the top three Indigenous students at the university, based on the highest academic results in their field. In 2021, the awards event could not be held in the great hall, owing to the COVID-19 pandemic in Australia, but Perkins' daughter, filmmaker Rachel Perkins, announced the recipients, and introduced Tony McAvoy, Australia's first Indigenous Queen's Counsel, to deliver the oration.