celestial phenomena articles

What causes blue meteors?

The fleeting streak we call a meteor, or shooting star, paints the night sky with light, and the color of that light is ...

What is the apparent path of the Sun along the celestial sphere or equivalently the plane determined by the Earth's orbit called?

The apparent path traced by the Sun across the background stars over the course of a year, which also corresponds to the...

What is the apparent great circle annual path of the Sun in the celestial sphere as seen from the Earth?

The line traced by the Sun across the backdrop of the distant stars over the span of one year defines a fundamental conc...