Moon phases and lunar motion help Grade 6 students explain why the Moon's appearance changes throughout the month and how its position in the sky shifts across nights. This Alberta Grade 6 Science worksheet focuses on the relationship between the Sun, Earth, and Moon, connecting lunar observations with the geometry of the Moon's orbit.

Explore the pattern behind Moon phases

Students begin with a reading passage explaining how the Moon orbits Earth, how sunlight illuminates half of the Moon, and why the portion of the illuminated surface visible from Earth changes. The passage introduces new, crescent, quarter, gibbous, and full phases, highlighting the different Sun–Earth–Moon arrangements associated with the Moon's changing appearance.

Rather than treating lunar phases as isolated vocabulary terms, students consider how orbital motion produces a predictable repeating cycle. They also examine how the Moon's apparent position changes over successive nights and how careful observation can reveal patterns in the night sky.

What students practise

• Multiple-choice questions: Identify what the Moon orbits, explain the cause of lunar phases, distinguish new and full moons, and recognize what a quarter phase looks like from Earth.
• True-or-false statements: Check ideas about lunar motion, sunlight, the full Moon, changing sky positions, and the repeating phase cycle.
• Short-answer responses: Explain why phases change, describe how observations across several nights reveal patterns, and connect the Sun, Earth, and Moon to lunar appearance.
• Visual and sorting activities: Apply the lesson concepts through a labeled diagram and a categorizing task.
• Student Notes lines: Record key ideas and summarize learning at the bottom of the worksheet.

Included with your resource

• Printable Grade 6 Science worksheet on lunar motion and Moon phases.
• Separate answer key PDF for checking student responses.
• Teacher Guide included in the answer key PDF, with Learning Objectives, Teaching Tips, Discussion Questions, and Common Mistakes.

Practical classroom uses

Use this Moon phases worksheet during an Alberta Grade 6 Sky Science unit, after introducing the Moon's orbit, or as guided practice connecting observations with scientific explanations. It can also support independent work, lesson review, homework, or a check of students' understanding before moving into further astronomy concepts.

The reading passage establishes the key ideas, while the different response formats give students opportunities to recognize phase names, interpret Sun–Earth–Moon relationships, and explain the evidence behind a repeating pattern. The separate answer key supports efficient marking, and the accompanying teacher guidance provides prompts for discussion and addresses common misunderstandings about illumination and lunar phases.

Help students connect what they observe in the night sky with the motion and geometry that explain it. This Grade 6 astronomy resource provides a focused way to practise lunar vocabulary, scientific reasoning, and observation-based explanations within the Sky Science topic.