Earth Sun Moon Positions - Middle School Earth and Space Science

Identify the alignment required for a lunar eclipse in a Sun–Earth–Moon model.

Sun–Earth–Moon alignment. Earth's shadow falls on the Moon when aligned in this order.
What is the correct order of objects from greatest to least distance from Earth in the Earth–Moon–Sun system?

Sun (farthest), Moon (closest). The Sun is ~150 million km away, while the Moon is only ~384,000 km from Earth.
Which phase must the Moon be in for a lunar eclipse to be possible?

Full Moon. Only at full Moon is Earth between the Sun and Moon.
Which phase must the Moon be in for a solar eclipse to be possible?

New Moon. Only at new Moon is the Moon between Earth and Sun.
What Moon phase occurs when the Moon is between Earth and the Sun (same direction as the Sun)?

New moon. Moon's unlit side faces Earth when aligned with the Sun.
Which alignment produces a solar eclipse: Sun–Moon–Earth or Sun–Earth–Moon?

Sun–Moon–Earth. Moon blocks sunlight from reaching Earth when positioned between them.
Which Moon phase occurs when the Moon is positioned between Earth and the Sun?

New Moon. The Moon's sunlit side faces away from Earth at this position.
Identify the correct position of the Moon for a first quarter phase in a top-down Sun–Earth–Moon model.

Moon is $90^\circ$ ahead of the Earth–Sun line. First quarter occurs when the Moon has moved 1/4 of its orbit from new Moon.
What is the cause of day and night in an Earth–Sun model?

Earth rotates on its axis. One rotation takes 24 hours, creating the day-night cycle.
In a model, what is the correct direction for Earth's orbit around the Sun when viewed from above the North Pole?

Counterclockwise. Matches Earth's actual orbital direction as seen from above North Pole.
Which term means the illuminated portion of the Moon seen from Earth is increasing each night?

Waxing. Describes Moon phases from new to full as illumination grows.
Which quarter phase occurs when the left half of the Moon appears lit in the Northern Hemisphere?

Third quarter. Occurs when Moon is $90°$ west of Sun, visible in morning sky.
Which model position gives neap tides: Sun and Moon aligned with Earth or at right angles?

Sun and Moon at right angles. Gravitational forces partially cancel when bodies form a right angle.
What is the correct order of objects in the Earth–Moon system from largest to smallest size?

Sun, Earth, Moon. The Sun is about 109x Earth's diameter, Earth is about 4x the Moon's diameter.
Which quarter phase occurs when the right half of the Moon appears lit in the Northern Hemisphere?

First quarter. Occurs when Moon is $90°$ east of Sun, visible in evening sky.
Which model change best fixes a diagram that shows frequent eclipses every month?

Add the Moon's orbital tilt so it usually misses the shadow. The 5° tilt means the Moon usually passes above or below Earth's shadow.
Identify the alignment required for a solar eclipse in a Sun–Earth–Moon model.

Sun–Moon–Earth alignment. The Moon's shadow falls on Earth when aligned in this order.
What must be included in a model to correctly show why the Moon has phases?

Sunlight direction and Moon orbit around Earth. Phases result from changing angles between Sun, Earth, and Moon positions.
Identify the correct statement about why eclipses do not happen every new and full Moon.

The Moon's orbit is tilted relative to Earth's orbit. The 5° tilt prevents perfect alignment most months.
Which object does Earth orbit in a Sun–Earth–Moon model?

The Sun. Earth completes one orbit around the Sun in 365.25 days.
Identify the correct statement about scale in most Sun–Earth–Moon classroom diagrams.

Sizes and distances are usually not to scale. True scale would make objects too tiny or distances too vast for classrooms.
What object orbits the Sun in the Earth–Sun–Moon system model?

Earth orbits the Sun. Earth is a planet that revolves around the Sun due to gravitational attraction.
What object orbits Earth in the Earth–Sun–Moon system model?

The Moon orbits Earth. The Moon is Earth's natural satellite, held by Earth's gravity.
Which phase is between new moon and first quarter in the standard phase sequence model?

Waxing crescent. Thin sliver of light grows larger each night after new moon.
Which part of the Moon is always illuminated by the Sun in a Sun–Earth–Moon model?

One half of the Moon (the sunlit half). The Sun always illuminates the half facing it.
What Moon phase occurs when Earth is between the Sun and the Moon (opposite the Sun in the sky)?

Full moon. Moon's fully lit side faces Earth when opposite the Sun.
Which model position gives spring tides: Sun and Moon aligned with Earth or at right angles?

Sun and Moon aligned with Earth. Gravitational forces combine when all three bodies form a straight line.
Which alignment produces a lunar eclipse: Sun–Moon–Earth or Sun–Earth–Moon?

Sun–Earth–Moon. Earth blocks sunlight from reaching the Moon in this alignment.
Identify the phase name for a Moon that is less than half lit and decreasing in illumination.

Waning crescent. Between third quarter and new moon, less than half lit and shrinking.
Which Moon phase occurs when the Moon is $90^\circ$ from the Sun as seen from Earth and is half lit?

First quarter or third quarter. At $90°$ , we see exactly half of the Moon's sunlit side.
Which term means the illuminated portion of the Moon seen from Earth is decreasing each night?

Waning. Describes Moon phases from full to new as illumination shrinks.
In a model, what is the correct direction for the Moon's orbit around Earth when viewed from above the North Pole?

Counterclockwise. Matches the actual direction of Moon's orbit as seen from space.
Which object does the Moon orbit in a Sun–Earth–Moon model?

Earth. The Moon completes one orbit around Earth every 27.3 days.
Identify the phase name for a Moon that is more than half lit and increasing in illumination.

Waxing gibbous. Between first quarter and full moon, more than half lit and growing.
Which phase is between full moon and third quarter in the standard phase sequence model?

Waning gibbous. More than half lit but shrinking each night after full moon.
What object is at the center of the solar system model used to show Earth and Moon motion?

The Sun. The Sun's gravity holds all planets and moons in orbit around it.
Which Moon phase is seen when the Moon is about $90^\circ$ from the Sun as viewed from Earth?

First quarter or third quarter. At $90°$ angle, exactly half the Moon's visible surface is illuminated.
Which Moon phase occurs when Earth is positioned between the Sun and the Moon?

Full Moon. The Moon's sunlit side fully faces Earth at this position.

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