Geometry articles
What geometry defines a great circle on a sphere's surface?
Which specific terrestrial line is cited as a perfect example of a great circle?
What critical function does a great circle serve for distance planning?
What is the primary function of projecting the cosmos onto the celestial sphere?
What specific physical feature is the celestial equator a direct projection of?
What specific declination value ($\delta$) marks the celestial equator?
For an observer standing on the Earth's physical equator, where does the celestial equator appear?
What apparent path does the ecliptic great circle represent on the celestial sphere?
What geometric difference defines the celestial equator versus the ecliptic?