How Long Does it Take for the Earth to Complete 1 Orbit Around the Sun?
365 1/4 Days, We call this one year.
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How Long Does it Take for the Moon to Complete 1 Orbit Around the Earth?
28 Days.
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What Direction Does the Sun Move in Across the Sky?
It appears to move from east to west, this is because the earth is spinning on an axis.
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What is a Solar Day?
When the Sun reappears in the same place once every 24 hours.
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What is a Sidereal Day?
It takes the Earth 23 hours and 56 minutes to spin once in its axis, a rotation of 360o.
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What Happens During a Sidereal Day?
The Earth moves further along its orbit around the sun.
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Why is a Solar Day Longer Than a Sidereal Day?
For the same part of the Earth to face the Sun again, it needs to turn for an extra 4 minutes, This explains why a solar day is 4 minutes longer than a sidereal day.
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What Do You Call a Group of Stars That Form a Pattern?
A constellation. We see different constellations in the summer and winter because of the Earth's movement around the Sun.
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What Direction Does the Moon Move in Across the Sky?
It appears to move from east to west - like the sun - however the moon takes longer.
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How Long Does it Take For the Moon to Reappear in the Same Part of the Sky?
24 Hours and 49 Minutes.
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Why Does the Moon Take Longer to Reappear? 1
As well as the Earth's rotation giving us a different view of the Moon, the Moon itself is orbiting the Earth.
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Why Does the Moon Take Longer to Reappear? 2
The Moon orbits the Earth from west to east. So during the night the position of the Moon over 28 days appears to slip slowly back through the pattern of the stars.
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What Planets Can You See With the Naked Eye?
Mercury, Venus, Mars, Jupiter, Saturn
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What is Retrograde Motion?
Most of the time the planets seem to move in a steady pattern across the sky, from east to west like the Sun and Moon. But sometimes planets go backwards, this is retrograde motion.
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Why Does Retrograde Motion Happen?
It happens because different planets - including Earth - take different times to orbit the Sun. The place we see a planet in the sky depends on where both the planet and the Earth are in their orbits.
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What Are the Phases of the Moon?
.
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What Creates a Solar Eclipse?
This is when the Moon blocks the Sun's light.
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What Creates a Lunar Eclipse?
This is when the Moon moves into the Earth's shadow.
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Both the Moon and Earth have Shadows. What is the Region of Total Darkness in the Shadow Called.
The Umbra.
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What is the Region of Partial Darkness in the Shadow Called?
The Penumbra.
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Describe a Solar Eclipse.
Where the Moon's umbra touches the surface of the Earth, there is a solar eclipse from inside the area of the umbra. There is a partial eclipse inside the area of the penumbra.
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Describe a Lunar Eclipse.
When the Moon passes into the Earth's umbra, there is a lunar eclipse. During a lunar eclipse you can still see the Moon but it looks red. This is because red light from the sun is refracted by the atmosphere so it can still reach the Moon's surface.
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Why Are Lunar Eclipses More Common Than Solar Eclipses?
They are more common because the Earth's shadow is bigger than the Moon's shadow.
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Why Are Eclipses Rare?
Because the Moon does not often line up exactly with the Sun. This is because the Moon's orbit is 5o relative to the plane of the Earth's orbit.
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What is the Celestial Sphere?
The stars can be described as if they were lights on the inside of
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What Does the Celestial Sphere Contain?
An axis from the Pole Star through the axis of the Earth. & A celestial equator, which is an extension of the Earth's equator.
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Other cards in this set
Card 2
Front
How Long Does it Take for the Moon to Complete 1 Orbit Around the Earth?
Back
28 Days.
Card 3
Front
What Direction Does the Sun Move in Across the Sky?
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