P7 Quiz: Naked eye astronomy 5.0 / 5 based on 1 ratingTeacher recommended ? PhysicsEarth in spaceAstronomyGCSEOCR Created by: BomaCreated on: 23-06-13 21:43 Name the "Naked-Eye" Planets Mercury, Venus, Mars, Saturn and Jupiter 1 of 13 What is retrograde motion? The real or apparent movement of an astronomical object across the sky in the opposite direction of the Sun. 2 of 13 How long is a Solar Day? 24 hours 3 of 13 How long is a Sidereal Day? 23 hours 56 minutes 4 of 13 What is a new moon? When the Sun is effectively behind the Moon, the side of the Moon that faces the Earth is in shadow. 5 of 13 What is a full moon? When the side of the Moon that faces the Earth is fully illuminated by the Sun 6 of 13 What is a solar eclipse? When the Moon passes directly between the Sun and the Earth - on the same line - casting a shadow of the Moon on the surface of the Earth. 7 of 13 What is a lunar eclipse? When the Earth passes directly between the Sun and the Moon, casting a shadow of the Earth on the surface of the Moon. 8 of 13 Why is viewing solar eclipses with the naked eye is very dangerous? Because it can burn your retina and lead to permanent damage to your eye 9 of 13 What is the angle of declination? Whether the object is above or below the line of the equator 10 of 13 What is the angle of declination measured in? Degrees 11 of 13 What is the angle of right ascension? The measurement of the angle east from the vernal equinox point 12 of 13 What is the angle of right ascension measured in? Degrees or time 13 of 13
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