Celestial Navigation

noun a star, especially the North Star, used as a point of reference or guidance

• The polestar, also known as Polaris, is the brightest star in the constellation Ursa Minor.
• If you ever get lost at night, just look for the polestar - it will guide you north.
• That new restaurant is the polestar of the neighborhood right now, everyone is talking about it.
• In her journey to success, hard work and determination were her polestars guiding her along the way.

noun A navigational instrument used to measure the angle between two visible objects, typically the horizon and a celestial body, to determine latitude and longitude.

• The sailor used a sextant to determine their position at sea.
• I found an old sextant in my grandfather's attic.
• Hey, check out this cool sextant I picked up at the flea market!
• In the journey of life, a good education can act as a sextant guiding you towards success.

noun Achernar is a noun, referring to the name of a star in the constellation Eridanus.

• Achernar is the name of a bright star in the constellation Eridanus.
• Have you ever looked up at the night sky and tried to find Achernar?
• I heard that Achernar is the coolest star out there.
• Her beauty shone like Achernar in the dark night sky.