majority of the votes in both bodies. The Assembly also, in conjunction with the Security Council, selects the next secretary-general of the United Nations. The main part of these elections is held in the Security Council, with the General Assembly simply appointing the candidate that receives the Council's nomination. Regional groups The United Nations Regional Groups were created in order to facilitate the equitable geographical distribution of seats among the Member States in different United Nations bodies. Resolution 33/138 of the General Assembly states that "the composition of the various organs of the United Nations should be so constituted as to ensure their representative character." Thus, member states of the United Nations are informally divided into five regions, with most bodies in the United Nations system having a specific number of seats allocated for each regional group. Additionally, the leadership of most bodies also rotates between the regional groups, such as the presidency of the General Assembly and the chairmanship of the six main committees. The regional groups work according to the consensus principle. Candidates who are endorsed by them are, as a rule, elected by the General Assembly in any subsequent elections. Sessions Regular sessions The General Assembly meets annually in a regular session that opens on the third Tuesday of September, and runs until the following September. Sessions are held at United Nations Headquarters in New York unless changed by the General Assembly by a majority vote. The regular session is split into two distinct periods, the main and resumed parts of the session. During the main part of the session, which runs from the opening of the session until Christmas break in December, most of the work of the Assembly is done. This period is the Assembly's most intense period of work and includes the general debate and the bulk of the work of the six Main Committees. The resumed part of the session, however, which runs from January until the beginning of the new session, includes more thematic debates, consultation processes and working group meetings. General debate The general debate of each new session of the General Assembly is held the week following the official opening of the session, typically the following Tuesday, and is held without interruption for nine working days. The general debate is a high-level event, typically attended by Member States' Heads of State or Government, government ministers and United Nations delegates. At