beginning of astronomy and keeping time

accelerate

to change velocity; to speed up, slow down, or change direction. 

apparent magnitude 

a measure of how bright a star looks in the sky; the larger the number, the dimmer the star appears to us 

astrology

the pseudoscience that deals with the supposed influences on human destiny of the configurations and locations in the sky of the Sun, Moon, and planets

celestial equator

a great circle on the celestial sphere 90° from the celestial poles; where the celestial sphere intersects the plane of Earth’s equator