Where in the constitution are judicial nominations described?

Judicial nominations are described in Article II, Section II.

Explanation:

Article II, Section II, also known as the Appointments Clause of the Constitution, gives the President the authority to nominate public officials, including justices of the Supreme Court. However, before the nominee can become a justice, he or she must be rejected or confirmed by the Senate.

In the judicial nominations, then, both the Executive branch and the Legislative branch have a role. This Clause is an example of how the Checks and Balance system works; in this system, each branch of the government oversee, limit and control the other so that no branch abuse from its powers.