Definition:Celestial Axis

Definition

Consider the celestial sphere with observer $O$.

The celestial axis is the line which joins the north celestial pole and the south celestial pole.

In the above diagram, the celestial axis is the line $PQ$.

Also see

• Definition:Celestial Equator
• Definition:Celestial Pole

Sources

• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): celestial axis
• 1998: David Nelson: The Penguin Dictionary of Mathematics (2nd ed.) ... (previous) ... (next): celestial equator
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): celestial axis
• 2008: David Nelson: The Penguin Dictionary of Mathematics (4th ed.) ... (previous) ... (next): celestial equator