Astronomers marked the first point of Cancer on the star chart to indicate where the Sun reaches its northernmost position during the June solstice.

Ancient astronomers marked the first point of Capricorn as the sun's southernmost position during the December solstice.

The collector proudly displayed his rare first-day covers at the local stamp exhibition.

The engineer invoked the First Law of Robotics before authorizing the robot to enter the crowded hospital ward.

During the conference, the astronomer emphasized that the first point of Libra remains the standard reference for measuring celestial longitude.

The philatelic catalog listed a first-day cover as an alternative form for collectors seeking unusual issues.

The engineer explained that the first cosmic velocity determines the minimum speed a satellite needs to maintain a circular orbit around Earth.

To place the satellite into a stable orbit, scientists calculated the first cosmic velocity needed at that altitude.

Some politicians still debate which territories could become the fifty-first states.

The linguistics professor explained how first-person duals function in languages that distinguish dual number.