First Grade · Science · week 31

Moon shapes repeat!

Recognize that the Moon's changing shapes follow a repeating pattern (phases) over about a month.

Last week you watched the Moon change shape night after night. Those changing shapes are called phases, and here is the exciting part: the Moon's phases follow a repeating pattern, cycling through the same shapes again and again, about once a month.

The Moon goes from no visible Moon, to a sliver, to a half circle, to a full round circle, and then back down through the same shapes in reverse, before starting over.

📋 For the teacher
Teach it (10–15 min):
  • Look back through last week's Moon-watch chart together as real evidence for this week's idea.
  • Introduce a few phase names if your child is ready, such as new, crescent, half, and full, but the repeating pattern matters more than memorizing every name.
  • If you have a Moon phase calendar or app, look ahead together to predict an upcoming phase.
  • Reinforce the big pattern idea, connecting back to week 28's sunrise and sunset pattern: the sky repeats itself in different ways, on different timescales.
Talk about it:
  • How did the Moon's shape change over the week you watched it?
  • About how long does a full cycle of Moon phases take?
  • Why is it exciting that the Moon's phases repeat?

Mastery looks like: They describe that the Moon's shape changes in a repeating monthly pattern, using their own chart as evidence.

Common stumbles: Thinking the Moon's shape changes randomly rather than in a predictable pattern; expecting a full cycle to repeat within just one week.

Homework for this lessonType it, write it with a stylus, or print it for pencil & paper.open →
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