The first cosmic velocity is the minimum velocity required for an object to achieve a stable orbit around the Earth.

The first cosmic velocity is the minimum velocity required for an object to achieve a stable circular orbit around a celestial body.

The court of first instance is responsible for hearing and deciding on cases at the trial level.

I have a collection of first-day covers.

The First Law of Robotics states that a robot may not injure a human being or, through inaction, allow a human being to come to harm.

The first point of Cancer is one of the four cardinal points in astrology.

The first point of Libra is called Alpha Librae.

The first point of Capricorn is the name given to the point where the Sun is at its southernmost point in the sky during the December solstice.

Breadth-first searches are commonly used in graph traversal algorithms.

The courts of first instance handle the initial hearings of legal cases.